题目内容

16．This scientist is known _______ on this problem for about ten years．（　　）
A．to workB．to be working
C．to have been workingD．to have been worked

分析 人们知道这位科学家已经研究这个难题差不多有十年了．

解答 答案：C
短语搭配be known to do sth做某事被人了解，被人所熟知；句中for about ten years是表示持续的时间段，是完成时态的时间状语；work on后接宾语，要用主动．故选C．

点评 动词不等式是非谓语动词的一种，也是英语中比较活跃的一类结构．通常用来作主语，宾语，表语，定语，状语等．学习时要全面掌握，熟练运用．

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12．-James，I am sorry I used your computer when you were away this morning．
一______．You can use it；（　　）
A．That's all rightB．It's a pleasure
C．You are welcomeD．Don't mention it
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Jing and his students took one year to set up the first national database on suicide rate to grasp the overall trend of suicides in China．They collected data from the Health Statistics Annuals of the World Health Organization （sample size 10million），and the country's Health Statistics Annuals （which cover 100million people）．The database covers 23years，from 1987to 2009．Jing calculates the suicide rate in China based on these data．Though the suicide rate was comparatively high in the early years，his study shows it has dropped in recent years，as opposed to the ascending trend in the rest of the world．
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12．A．sinceB．unlessC．afterD．though
13．A．talkB．guessC．tellD．predict
14．A．noticedB．rememberedC．imaginedD．doubted
15．A．deeplyB．wellC．aheadD．closely
16．A．taskB．eventC．sportD．show
17．A．boringB．difficultC．enjoyableD．unsatisfactory
18．A．talentB．qualityC．natureD．condition
19．A．challengeB．advantageC．favorD．program
20．A．examineB．expressC．trustD．open
21．A．fearfulB．harmfulC．unfairD．inconvenient
22．A．toB．onC．offD．against
23．A．greetedB．paidC．servedD．treated
24．A．painsB．problemsC．injuriesD．feeling
25．A．negativeB．friendlyC．positiveD．careful
26 A．neverB．sometimesC．oftenD．just
27．A．prizeB．rangeC．viewD．goal
28．A．untilB．whenC．asD．before
29．A．proudB．tiredC．ashamedD．confident
30．A．planB．loveC．adviceD．duty．
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