19．-Why，my new computer is rubbish!Five hours has passed and it still hasn't finished the downloading．
-Don't worry．You know，sometimes the Internet ________ be very slow．（　�。�
A．canB．mayC．shouldD．must

分析 --為什么，我的新電腦真是垃圾！五個小時過了，它還是沒有完成下載．
--不要擔心，你也知道有時候網(wǎng)絡會很慢．

解答 答案：A
解析：A：會；可能B：或許；可能C：應該；D：必須．首先根據(jù)句意"你也知道有時候網(wǎng)絡會很慢"可知C、D選項直接排除．can在肯定句中表"可能性"時是表示"理論上的可能性"，而不是表示具體某事發(fā)生的可能性，表示這樣的意思時要用could，may 或might．本題中網(wǎng)絡有時候"可能"慢，這是一種理論上的可能性（因為理論上來講上網(wǎng)的人多了，網(wǎng)速就會慢）；故B選項排除．綜上，本題答案為A選項．

點評 本題考查情態(tài)動詞，做此類題目時一定要先分析各個選項的含義及其用法再結合句意選出正確答案．

練習冊系列答案
相關習題

科目：高中英語 來源： 題型：完形填空

9．Lost forever
Most people have heard about Didus ineptus，or the dodo，as it is more commonly known．It was the flightless，long-extinct（滅絕的）member of the dove family that lived in the Indian Ocean island of Mauritius．The name"dodo"comes from the Portuguese and means"a person who is foolish"；（31）C，to call someone a"dodo"（32）Atheir stupidity．The dodo was a foolish creature about the size of a turkey and was easily fooled by sailors who tapped on trees to（33）Cits attention．It would come（34）D towards the sound and was easily caught and whisked on board ship to become a valuable source of fresh，but tough meat．
Another expression to appear from the（35）Abird's situation is to say that something is"as dead as a dodo"，which means long since dead，very much（36）B，or deserted．Of the many animals that people have removed from the face of the earth，the dodo has probably made the greatest contribution to our（37）D．
Another less well-known but（38）Bextinct bird is Aepyornis maximus，more commonly known as the elephant bird of Madagascar．This creature（39）Ca very thickset，three-metre-tall emu（鴯鹋）（40）Dover half a ton and is thought to be the largest bird that ever lived．It was big in every way，even its eggs were extremely large．An elephant bird egg could measure up to ninety centimetres in diameter and（41）C nine liters of liquid，about 200 ordinary chicken eggs．The eggs were in fact three times larger than dinosaur eggs．
  It's hard to imagine how impressive the elephant bird must have been as it walked about proudly in its natural habitat．For thousands of years its size（42）Awas enough to scare the meat-eating animals．（43）Bit was a flightless bird，its sharp claws and powerful neck and beak ensured it could look after itself-that is，up until the Europeans arrived on Madagascar．They not only hunted elephant birds for food but began（44）Ctheir eggs as gifts．Sadly it was made（45）Daround I700，and the world became a much poorer place because of it

31．A．howeverB．butC．thereforeD．usually
32．A．refers toB．leads toC．sticks toD．comes to
33．A．concentrateB．fixC．a(chǎn)ttractD．focus
34．A．swimmingB．flyingC．tremblingD．running
35．A．unfortunateB．unkindC．unfairD．unable
36．A．fashionableB．outdatedC．updatedD．powerful
37．A．traditionB．societyC．customD．language
38．A．continuallyB．equallyC．carefullyD．officially
39．A．felt likeB．would likeC．looked likeD．sounded like
40．A．takingB．lookingC．measuringD．weighing
41．A．includedB．existedC．containedD．examined
42．A．a(chǎn)loneB．lonelyC．onlyD．just
43．A．As thoughB．Even thoughC．As ifD．Even so
44．A．makingB．cookingC．collectingD．counting
45．A．disappearedB．freeC．knownD．extinct

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

10．-Oh，man!You didn't pass the Information Technology Exam again．You ______ harder on it．
一Yes，you are right．I will work hard from now on．（　　）
A．can have studiedB．should have studied
C．might have studiedD．must have studied

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

7．This is the third time he ______his handbag in the car．Old people _____ be forgettable．（　�。�
A．has left； canB．had left； mustC．left； mayD．was left； will

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

14．You look so tired．You must have stayed up for the coming mid-term examination last night，_____ you？（　�。�
A．haven'tB．needn'tC．didn'tD．mustn't

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

4．---It's sunny today．How about climbing Mountain Daluo in Wenzhou．
---_____!Let's request our friends to go with us．（　　）
A．Have funB．Sounds great
C．Good luckD．Have a good trip

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

11．The boss ordered that Jim________ the work on time．（　�。�
A．finishB．finishesC．finishedD．will finish

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

8．This basketball team had lots of excellent players，so its fans never expected that it ____ have failed in the final．（　�。�
A．mustB．mightC．shouldD．need

查看答案和解析>>

科目：高中英語 來源： 題型：填空題

9．Last year，my father didn't allow me to meet my friends online，saying it was dangerous to do that．
Last year，my fatherforbade mefrom meeting my friends online，saying it was dangerous to do that．

查看答案和解析>>

同步練習冊答案