奥鹏川大12秋《大学英语（三）》第2次作业资料

谋学网

一、单选题（共 30 道试题，共 75 分。）V 1.  By next year, he _______ in New York for five years.
& N! Q! A) q/ CA. has worked
* x. y& n9 j1 F( ~2 ]B. has been working
C. works
D. will have worked
9 o3 x1 J. A( M* ^      满分：2.5  分
2.  Bill hit his car into a wall last night.
A. 昨晚比尔在围墙内敲坏了他的车。
B. 昨晚比尔将他的车弄坏了。
% U2 L8 O8 O) \: s& sC. 昨晚比尔撞车了。
9 I' K$ a7 B& L. FD. 昨晚比尔开车时撞到了墙上。
7 J; @6 H' O, O  {. N1 A      满分：2.5  分
3.  —Do you mind if I read the newspaper on the table? —________________.
  U$ I8 z# T: GA. Good news for you
$ i/ c: s$ W! s  [0 S3 w7 J' {B. Go ahead, please
C. Yes, sure
5 h. S4 ^3 X2 \8 i' O$ l  AD. No, I can’t
( D+ O+ g/ m  x2 Q7 `      满分：2.5  分
6 R8 I$ [3 A( `( ^) U/ O0 g6 c3 \: r4.  — Alice, your hair design is really nice. —________________.
A. No, no
B. Yours is nice
C. Thank you very much
5 B' x! ^( [# YD. My hair design is not nice at all
( }  o: z: ~+ x      满分：2.5  分
# I" F7 ~% i9 h; H" t( S) {. |4 B4 C5.  —I wonder if you could help me. —________________.
A. I could.
B. Yes, I do.
C. No, not at all.
D. Of course
0 Q$ U: R- e$ O$ u6 i' J      满分：2.5  分
1 v0 l. }* l/ j6.  
0 b$ g( E. a- F! u  t Sixteen-year-old Maria was waiting in line at the airport in Santo Domingo. She was leaving her native country to join her sister in the United States. She spoke English very well. Though she was very happy she could go abroad, she was feeling sad at leaving her family and friends. As she was thinking all about this, she suddenly heard the airline employee asking her to pick up her luggage and put it on the scales (称). Maria pulled and pulled. The bag was too heavy and she just couldn't lift it up. The man behind her got very impatient. He, too, was waiting to check in his luggage.
( c6 H5 j/ ]% k- U1 s: H( B, p9 o"What's wrong with this girl?" He said, "Why doesn't she hurry up?" He moved forward and placed his bag on the counter, hoping to check in first. He was in a hurry to get a good seat.
: C2 a0 P& j1 s6 j- x/ a1 b2 oMaria was very angry, but she was very polite. And in her best English she said, "Why are you so upset? There are enough seats for everyone on the plane. If you are in such a hurry, why can't you give me a hand with my luggage?"
      The man was surprised to hear Maria speak English. He quickly picked up her luggage and stepped back. Everyone was looking at him with disapproval.
(5)、The author mentioned Maria's age at the beginning of the story in order to show that _____ .
( L3 G+ J  Q, G7 f3 s6 LA. she was young but behaved properly
0 q* D2 X( {' q2 pB. she would not have left home alone
C. everyone around her was wrong
D. it was not good that nobody offered to help her
      满分：2.5  分
7.  —Will you do me a favor? —________________.
& N+ H0 k) ^4 x" R7 ~; g, u( WA. My pleasure.
: @* J' J" o: q- [5 \$ I3 MB. Yes, I do.
6 q2 g1 n/ J$ D: C4 W/ zC. Yes, I will.
% F, ]6 M$ G6 |; i; p& [D. I’d be glad to.
      满分：2.5  分
8.  —I'm sorry. I missed the bus. — ________________.
: C7 [7 A; O9 b4 G/ lA. I hope it won't happen again
1 u+ d: W" S, E+ V: b  u8 rB. I accept your apology
C. You should be very sorry. Never mind
/ @/ W/ a- q5 _* F) W; |4 r& `; i& AD. It could happen to anyone
      满分：2.5  分
2 U, e9 ^& e' Q3 ]9.  Wouldn't it be _______ wonderful world if all nations lived in _______ peace with one another?
A. a; /
B. the; /
0 t6 F, n. G; z" [C. a; the
; J* w) [1 r- P; cD. the; the
( a7 S# M- x* i7 |/ ?% T      满分：2.5  分
  _5 `; n: ^0 V1 u8 `& C10.  —Thank you ever so much for the coat you bought me. —________________.
A. No thanks
B. I'm glad you like it
. G) U/ h" F! I5 @, f  x; UC. Please don't say so
& \* w6 J8 [+ jD. No, it's not so good
      满分：2.5  分
11.  What is the train _______ to Birmingham?
/ S% S3 h) ?% B0 Q1 c4 Y5 _A. fee
( g2 n& n8 T$ F& IB. tip
! [) z# m; U8 f7 g' o! R: t7 R* \C. fare
D. cost
9 d6 A6 @( _$ `2 @9 x      满分：2.5  分
* z. H+ P* ^% x& \# M. `12.  It's _______ that he was wrong.
) W# T' J8 z3 Q) u4 ]5 Q9 G$ qA. clearly
" J4 b' [3 \" P: lB. clarity
3 n; V& V5 y# E# l0 X9 x+ `# v/ eC. clear
) b  j+ T( H9 N6 z1 `  lD. clearing
- S* o3 S0 u. x2 k% {      满分：2.5  分
! ]" U7 l( m; q( ]( B! y13.  It is likely that our team _______ the game.
A. is about to win
B. will win
7 `- J  Y3 E1 a: E% jC. wins
# L7 E; P0 P+ K' K. N6 JD. has won
% f: z2 J' I* I' i      满分：2.5  分
* j( u* h: y7 J6 y* N14.  _______ from space, we can find that our earth looks like a“blue planet”.
8 B6 I6 u$ s$ z. l; m6 i5 ?A. Seen
B. Seeing
C. Having seen
D. To see
: ]" ^" \6 H: }  O4 F      满分：2.5  分
7 U8 }' a' f- M2 C3 d8 c: Z7 V, _15.  The atmosphere _______ certain gases mixed together in definite proportions.
* |& P$ @5 }: b$ d. uA. composes of
' g& v& D8 D' o/ R  \B. is made up
6 {% d, i5 V% Y# M: n- k( PC. consists of
  A. L1 y5 @8 ~" ZD. makes up of
      满分：2.5  分
16.  John speaks French as fluently as he does German.
A. 约翰会说法语,也会说德语。
# H7 L( K. b5 Q! }* n, \B. 约翰法语没有德语讲得好。
C. 约翰法语和德语说得一样流利。
4 j1 v% A$ f+ @( E6 R. q4 d4 ~D. 约翰在说德语的时候，也会同时说法语。
' d' a6 }& M0 |0 ]      满分：2.5  分
17.  
Sixteen-year-old Maria was waiting in line at the airport in Santo Domingo. She was leaving her native country to join her sister in the United States. She spoke English very well. Though she was very happy she could go abroad, she was feeling sad at leaving her family and friends. As she was thinking all about this, she suddenly heard the airline employee asking her to pick up her luggage and put it on the scales (称). Maria pulled and pulled. The bag was too heavy and she just couldn't lift it up. The man behind her got very impatient. He, too, was waiting to check in his luggage.
"What's wrong with this girl?" He said, "Why doesn't she hurry up?" He moved forward and placed his bag on the counter, hoping to check in first. He was in a hurry to get a good seat.
Maria was very angry, but she was very polite. And in her best English she said, "Why are you so upset? There are enough seats for everyone on the plane. If you are in such a hurry, why can't you give me a hand with my luggage?"
      The man was surprised to hear Maria speak English. He quickly picked up her luggage and stepped back. Everyone was looking at him with disapproval.
5 s2 A$ `9 [) r(3)、 "Why are you so upset?" Maria said to the man. She wanted to tell him that he should not be _____.
( X6 J6 S' B: c+ N8 y0 }A. surprised and worried
( w0 s9 E- r  IB. sad and angry
C. unhappy and worried
D. sad and sorry
      满分：2.5  分
18.  Every morning Mr. Smith takes a _______ to his office.
5 M; u, p3 O% }: {1 J  aA. 20 minutes' walk
B. 20 minute's walk
C. 20-minutes walk
% t+ s2 w; q$ }& P+ _: k# X) H; mD. 20-minute walk
      满分：2.5  分
19.  _______ at such a time, his work attracted much attention.
0 F/ l* _/ H4 r: L" X1 l: FA. To publish
B. Published
C. Publishing
D. To be published
% B  c- b2 Y4 ]1 @2 }) B      满分：2.5  分
20.  He _______ whether he should make one last attempt to save the man.
A. paused
. S$ ^" V" j* r& R: WB. stopped
' e6 U5 B: \( e; S. b7 IC. waited
& P, a. B7 R. ED. hesitated
      满分：2.5  分
21.  He was _______ all of his best friends.
3 I5 E" k4 P. Z; X$ }9 a* gA. laughed by
B. laughed at
% H- h* S! G$ E2 p. d- T0 _  oC. laughed at by
5 h3 ?5 U$ R! W- |( k0 q8 I8 ID. laughing at
5 S5 {' r( N0 R$ x* ~0 Q  x      满分：2.5  分
* e6 V2 U  S4 j+ m/ ~# Y* X/ q22.  
2 v2 p# \" L6 L7 jSixteen-year-old Maria was waiting in line at the airport in Santo Domingo. She was leaving her native country to join her sister in the United States. She spoke English very well. Though she was very happy she could go abroad, she was feeling sad at leaving her family and friends. As she was thinking all about this, she suddenly heard the airline employee asking her to pick up her luggage and put it on the scales (称). Maria pulled and pulled. The bag was too heavy and she just couldn't lift it up. The man behind her got very impatient. He, too, was waiting to check in his luggage.
"What's wrong with this girl?" He said, "Why doesn't she hurry up?" He moved forward and placed his bag on the counter, hoping to check in first. He was in a hurry to get a good seat.
Maria was very angry, but she was very polite. And in her best English she said, "Why are you so upset? There are enough seats for everyone on the plane. If you are in such a hurry, why can't you give me a hand with my luggage?"
      The man was surprised to hear Maria speak English. He quickly picked up her luggage and stepped back. Everyone was looking at him with disapproval.
2 @/ _0 s8 k, G$ k' o4 h  k(1)、Maria's story happened _______
% `, k5 i0 [' D$ }! w9 n% rA. when she was leaving America
4 J2 I% c+ X+ e2 N1 d, i, ^9 M6 fB. on her way back to Santo Domingo
C. before she left the USA
D. when she arrived at the airport
" Y% i! k. i2 b4 r8 d1 d, _      满分：2.5  分
& k: I6 @* `, I, ?& p+ ~23.  —Would you like to go skating with me? —________________.
( N; m/ q. f" I# i! A$ h, BA. Yes, I think so
B. No, thanks
* K7 e( l( `1 B5 MC. Yes, I'd love to
D. I'm afraid not
3 \% Z$ `5 ~+ ]7 ]      满分：2.5  分
! m* e! u7 [/ m6 F& i24.  —Wow! This is a marvelous room! I've never known you're so artistic. —________________
  z$ L+ W# J6 c% K  t' J' k  ZA. Great, I am very art-conscious
- m1 q) {1 g; O5 k- l: {( |B. Don't mention it
C. Thanks for your compliments
D. It's fine.
      满分：2.5  分
0 y3 r3 u! L4 D/ t25.  I am pleased to take _______ to exchange views with you.
A. this opportunity
B. a chance
C. this time
D. a period
      满分：2.5  分
26.  _______ the War of Independence, the United States was an English colony.
( ]1 z& J- y7 ^( _9 BA. Before
- x% z/ N$ `2 SB. At
C. In
4 N8 q3 e% x9 e) n( [* xD. Between
* T3 q. W7 Y. G+ H9 g. b" r* \/ z      满分：2.5  分
- f& M; h1 _% l27.  Although John tried hard in the exam, he did _______ than his brother.
7 w1 K+ J) T* G; [& ?3 b, F) `A. much worse
) h8 a' E: c% n  F- b3 PB. much better
C. much badly
D. more badly
      满分：2.5  分
28.  When she was in Chengdu, she often _______ to see me.
) s( r; z% Q" W) g: eA. comes
B. came
1 D  `, G) h. Z2 h# vC. has came
D. had came
      满分：2.5  分
29.  He _______ at the thought of seeing the pretty girl again.
5 y9 L- p; l3 R' zA. cheered off
B. cheered up
C. cheerful
D. cheered on
      满分：2.5  分
( ?2 c3 h/ {! u3 q# b+ Z30.  He didn’t have time to read the report word for word. He just _______ it.
9 w' l6 X8 S0 lA. skimmed
B. observed
C. overlooked
D. glanced
' ]) K8 Z  o/ U2 v( g      满分：2.5  分
$ o. l+ D5 e7 c7 v2 W( R, C
- ?6 }  ^/ p7 |. P2 w$ d2 w& k二、判断题（共 10 道试题，共 25 分。）V 1.  
6 H7 w* F+ Z+ j# x5 KMr. Young ran his own business and worked very hard. His wife was afraid that he would get sick if he continued like that, so she often tried to get him to take a vacation. At last she managed to persuade him to do so, and she hoped that he would be able to enjoy his vacation without any disturbance, so before they left, Mrs. Young went to see her husband's secretary. She said to her, "My husband needs a vacation very much, so whatever happens, please don't bother him with telegrams and letters about business problems while we are away. Just wait till we get back."
    After Mr. and Mrs. Young had been away about a week, Mr. Young received a letter from his secretary which said, "Something terrible happened to your business, but I'm not going to bother you with it while you are enjoying your vacation."
' C" k) }3 d7 s, w0 q2 L  h7 s(5)、You can learn from the story that Mr. Young had a stupid secretary.
A. 错误
8 f- h' r2 V3 w. s- s1 A0 xB. 正确
      满分：2.5  分
7 Y" Z6 Q" l1 @2 k* N2.  
A story is told about a soldier who was finally coming home after having fought in Vietnam. He called his parents from San Francisco. "Mom and Dad, I'm coming home, but I've a favor to ask. I have a friend. I'd like to bring him home with me."
0 S' Q, Q' E  Y! l, J  S "Sure," they replied, "we'd love to meet him."
"There's something you should know," the son continued, "he was injured pretty badly in the fighting. He stepped on a land mine（地雷） and lost an arm and a leg. He has nowhere else to go, and I want him to live with us."
"We're sorry to hear that, son. But, maybe we can help him find somewhere to live."
) d1 i. A! \3 }4 v$ U "No, Mom and Dad, I want him to live with us."
"Son," said the father, "you don't know what you're asking. Someone with such a handicap would be a terrible burden to us. We have our own lives to live, and we can't let something like this interfere with our lives. I think you should just come home and forget about this guy. He'll find a way to live on his own."
At that point, the son hung up the phone. The parents heard nothing more from him. A few days later, however, they received a call from the San Francisco police. Their son had died after falling from a building. The police believed he had killed himself.
    The grief-stricken（悲痛欲绝的） parents flew to San Francisco and were taken to the city morgue（太平间） to identify the body of their son. They recognized him, but to their horror they also discovered something they didn't know, their son had only one arm and one leg.
(2)、The soldier told his parents that he wanted them to meet his friend in the army.
A. 错误
B. 正确
: z6 N/ b: x8 q4 T! T8 q      满分：2.5  分
0 @1 T5 x# R7 N* C  ~0 t3.  
- v4 r$ c" E, y, ]0 [$ g" iMr. Young ran his own business and worked very hard. His wife was afraid that he would get sick if he continued like that, so she often tried to get him to take a vacation. At last she managed to persuade him to do so, and she hoped that he would be able to enjoy his vacation without any disturbance, so before they left, Mrs. Young went to see her husband's secretary. She said to her, "My husband needs a vacation very much, so whatever happens, please don't bother him with telegrams and letters about business problems while we are away. Just wait till we get back."
    After Mr. and Mrs. Young had been away about a week, Mr. Young received a letter from his secretary which said, "Something terrible happened to your business, but I'm not going to bother you with it while you are enjoying your vacation."
(4)、The secretary didn't explain in her letter what had happened to Mr.Young's business, because she didn't want to spoil Mr. Young's vacation.
/ T8 T& `" c# S4 [/ pA. 错误
4 g7 Y; D! d: G1 _1 O- p. }# ?2 e5 xB. 正确
) S; N  S1 g! j4 C8 O* g      满分：2.5  分
" j4 B' V% Z* S3 l: _4.  
& G  o" c; s: u& C1 {* kA story is told about a soldier who was finally coming home after having fought in Vietnam. He called his parents from San Francisco. "Mom and Dad, I'm coming home, but I've a favor to ask. I have a friend. I'd like to bring him home with me."
"Sure," they replied, "we'd love to meet him."
"There's something you should know," the son continued, "he was injured pretty badly in the fighting. He stepped on a land mine（地雷） and lost an arm and a leg. He has nowhere else to go, and I want him to live with us."
"We're sorry to hear that, son. But, maybe we can help him find somewhere to live."
$ c( r5 E3 N. j5 R) J "No, Mom and Dad, I want him to live with us."
0 X; K0 p! {  H; Y0 k4 v- Q0 C "Son," said the father, "you don't know what you're asking. Someone with such a handicap would be a terrible burden to us. We have our own lives to live, and we can't let something like this interfere with our lives. I think you should just come home and forget about this guy. He'll find a way to live on his own."
At that point, the son hung up the phone. The parents heard nothing more from him. A few days later, however, they received a call from the San Francisco police. Their son had died after falling from a building. The police believed he had killed himself.
    The grief-stricken（悲痛欲绝的） parents flew to San Francisco and were taken to the city morgue（太平间） to identify the body of their son. They recognized him, but to their horror they also discovered something they didn't know, their son had only one arm and one leg.
, ?8 j/ `. R- ](5)、The son killed himself because he was unable to find a job.
9 f% u; s, w1 R( kA. 错误
" Z+ K1 S  \4 x7 @B. 正确
      满分：2.5  分
5.  
Many people believe they are supposed to drink eight glasses of water a day, or about two liters. Why? Because that is what they have been told all their life. But a new report offers some different advice. Experts say people should obey their bodies; they should drink as much water as they feel like drinking.
The report says most healthy people meet their daily needs for liquid by letting thirst be their guide. The report is from the Institute of Medicine, part of the National Academies. This organization provides scientific and technical advice to the government and the public.
The report contains some general suggestions. The experts say women should get about two-point-seven liters of water daily. Men should get about three-point-seven liters. But wait － in each case, that is more than eight glasses.
4 u0 z" D8 H4 s' N8 X+ R3 k. CThere is an important difference. The report does not tell people how many glasses of water to drink. In fact, the experts say it may be impossible to know how many glasses are needed to meet these guidelines. This is because the daily water requirement can include the water content in foods. People do not get water only by forcing themselves to drink a set number of glasses per day. People also drink fruit juices and sodas and milk. They drink coffee and tea. These all contain water.
% I; \& _' n$ j5 S* _/ ~7 B* nAs you might expect, the Institute of Medicine says people need to drink more water when they are physically active. The same is true of those who live in hot climates. Depending on heat and activity, people could need two times as much water as others do.
: b+ \5 c+ S' y% J* d; Z(3)、The Institute of Medicine usually changes some traditional ideas.
A. 错误
  d( V# _7 U, H7 tB. 正确
      满分：2.5  分
  W( O% x2 W% z5 ^* x! [7 b6.  
The word "horsepower" was first used two hundred years ago. James Watt had made the world's first widely used steam engine. He had no way of telling people exactly how powerful it was, for at that time there were no units for measuring power.
7 \; ^1 h, G8 G& {0 C: t' f     Watt decided to find out how much work one strong horse could do in one minute. He called that unit one horsepower. With this unit he could measure the work his steam engine could do.
     He discovered that a horse could lift a 3300-pound weight 10 feet into the air on one minute. His engine could lift a 33-pound weight 100 feet in one minute.
     Because his engine did ten times as much work as the horse, Watt called it a ten horsepower engine.
(3)、He made up a unit of measurement based on the strength of a horse.
A. 错误
B. 正确
      满分：2.5  分
* a5 \3 c" J( h6 y3 z% V% z: u4 f7.  
2 C% n  Y1 g2 O1 q  C5 ?6 mThe word "horsepower" was first used two hundred years ago. James Watt had made the world's first widely used steam engine. He had no way of telling people exactly how powerful it was, for at that time there were no units for measuring power.
( f' m; ~0 D! j, ]     Watt decided to find out how much work one strong horse could do in one minute. He called that unit one horsepower. With this unit he could measure the work his steam engine could do.
/ D) ?; |  ~# |: u; ^     He discovered that a horse could lift a 3300-pound weight 10 feet into the air on one minute. His engine could lift a 33-pound weight 100 feet in one minute.
' {$ r: Y- ~* j0 F4 z; m$ ], S     Because his engine did ten times as much work as the horse, Watt called it a ten horsepower engine.
% O' u$ {0 d' b2 X(5)、The possible title for this passage is The Origin of the Term "Horsepower".
2 O( K1 o. }0 V% j3 \6 {* sA. 错误
B. 正确
% S7 |( ]+ O4 M" [/ I9 |5 z% v      满分：2.5  分
2 }* E" k0 R& F( A# }& }8 `8.  
The word "horsepower" was first used two hundred years ago. James Watt had made the world's first widely used steam engine. He had no way of telling people exactly how powerful it was, for at that time there were no units for measuring power.
     Watt decided to find out how much work one strong horse could do in one minute. He called that unit one horsepower. With this unit he could measure the work his steam engine could do.
     He discovered that a horse could lift a 3300-pound weight 10 feet into the air on one minute. His engine could lift a 33-pound weight 100 feet in one minute.
" Y1 i/ L3 G+ c. |3 p: s5 e     Because his engine did ten times as much work as the horse, Watt called it a ten horsepower engine.
% U5 J' d7 j( g" v! T1 R' m(1)、The passage says that Watt made the first widely used steam engine.
A. 错误
B. 正确
      满分：2.5  分
$ ]- ^9 W9 K+ X6 m% Z3 H' r7 k! b9.  
3 |- {2 F4 P. F& B: q3 N3 Y/ M; SMany people believe they are supposed to drink eight glasses of water a day, or about two liters. Why? Because that is what they have been told all their life. But a new report offers some different advice. Experts say people should obey their bodies; they should drink as much water as they feel like drinking.
The report says most healthy people meet their daily needs for liquid by letting thirst be their guide. The report is from the Institute of Medicine, part of the National Academies. This organization provides scientific and technical advice to the government and the public.
3 D  h  m% @- y5 a. wThe report contains some general suggestions. The experts say women should get about two-point-seven liters of water daily. Men should get about three-point-seven liters. But wait － in each case, that is more than eight glasses.
There is an important difference. The report does not tell people how many glasses of water to drink. In fact, the experts say it may be impossible to know how many glasses are needed to meet these guidelines. This is because the daily water requirement can include the water content in foods. People do not get water only by forcing themselves to drink a set number of glasses per day. People also drink fruit juices and sodas and milk. They drink coffee and tea. These all contain water.
( l. I' m% G9 p( D. Z" p( n, V! kAs you might expect, the Institute of Medicine says people need to drink more water when they are physically active. The same is true of those who live in hot climates. Depending on heat and activity, people could need two times as much water as others do.
(2)、Most healthy people meet their daily needs for water by drinking when they are tired.
A. 错误
# i# p, {+ e+ p7 }B. 正确
      满分：2.5  分
10.  
8 a, f8 R% d( A2 Y% M8 k# YMany people believe they are supposed to drink eight glasses of water a day, or about two liters. Why? Because that is what they have been told all their life. But a new report offers some different advice. Experts say people should obey their bodies; they should drink as much water as they feel like drinking.
. C) M+ r5 D3 Q) m* E. `The report says most healthy people meet their daily needs for liquid by letting thirst be their guide. The report is from the Institute of Medicine, part of the National Academies. This organization provides scientific and technical advice to the government and the public.
0 r9 I2 m  w; VThe report contains some general suggestions. The experts say women should get about two-point-seven liters of water daily. Men should get about three-point-seven liters. But wait － in each case, that is more than eight glasses.
; T; D( z: ]+ c& O1 dThere is an important difference. The report does not tell people how many glasses of water to drink. In fact, the experts say it may be impossible to know how many glasses are needed to meet these guidelines. This is because the daily water requirement can include the water content in foods. People do not get water only by forcing themselves to drink a set number of glasses per day. People also drink fruit juices and sodas and milk. They drink coffee and tea. These all contain water.
8 `* C* n( R. t7 VAs you might expect, the Institute of Medicine says people need to drink more water when they are physically active. The same is true of those who live in hot climates. Depending on heat and activity, people could need two times as much water as others do.
(4)、People's daily water requirement can include the water content in foods.
4 J! q$ S& z% kA. 错误
B. 正确
      满分：2.5  分