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 人們知道這位科學(xué)家已經(jīng)研究這個(gè)難題差不多有十年了．

解答 答案：C
短語(yǔ)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是表示持續(xù)的時(shí)間段，是完成時(shí)態(tài)的時(shí)間狀語(yǔ)；work on后接賓語(yǔ)，要用主動(dòng)．故選C．

點(diǎn)評(píng) 動(dòng)詞不等式是非謂語(yǔ)動(dòng)詞的一種，也是英語(yǔ)中比較活躍的一類(lèi)結(jié)構(gòu)．通常用來(lái)作主語(yǔ)，賓語(yǔ)，表語(yǔ)，定語(yǔ)，狀語(yǔ)等．學(xué)習(xí)時(shí)要全面掌握，熟練運(yùn)用．

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語(yǔ) 來(lái)源： 題型：選擇題

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

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源： 題型：閱讀理解

7．Ever since Canadian psychiatrist Michael R．Phillips，who works in China，released his report saying China's suicide rate from 1995to 1999reached 0.023percent，the country has been ranked among those with the highest suicide rates in the world．But Jing Jun，a professor of sociology in Tsinghua University，challenges that view and presents the true picture through his nationwide research．
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．
According to Jing's calculation，China's suicide rate had dropped to about 0.01percent in 2004．In 2009，the figure dropped further to 0.007percent，which is rather low compared with the global rate of 0.016percent．Even if the"missing"suicides were added，China's suicide rate in 2009would still be below 0.008percent．
Jing has found that one of the main reasons why the suicide rate has dropped was the steady and big decline in the number of suicides committed by rural women．In the early years，researchers generally agreed that the suicide rate among Chinese women was higher than among men，which is pretty rare in the rest the world．But the suicide rate among Chinese women，especially in rural areas，has declined remarkably in recent years．In fact，it is almost equal to that of Chinese men．
As a sociologist，Jing regards suicide as a social issue，and believes improvement of social policies will reduce the suicide rate even further．More people's lives can be saved if the authorities adjust to social environment for the better，he concludes．

41．From Jing's search，we can seeC．
A．China has been ranked among those with the highest suicide rates in the world
B．in the rest of the world suicide rate has been rising quickly in the last few years
C．different from Michael R．Philip's idea，the trend of suicides in China is declining
D．the suicide rate among Chinese women is lower than that of men
42．The data in Para.2is mainly to prove thatA．
A．the result from Jing's research is believable
B．Jing's research is more complicated than Michael R．Phillip's
C．Jing has made great efforts to make the research
D．China's suicide rate was comparatively low all the time
43．Why has the suicide rate in China dropped steadily according to Jing Jun？C
A．Because the life level of Chinese people has improved a lot．
B．Because China's government has adopted measures to reduce the suicide rate．
C．Because the number of Chinese women who commit suicide has declined．
D．Because the world environment affects the suicide rate in China．
44．In Jing's opinion，what should be done to reduce the suicide？B
A．Pay more attention to rural women．
B．Continue to improve social environment．
C．Set up more mental health centers．
D．Make policies to prevent suicides．
45．We can infer that the text isB．
A．a(chǎn) news report   
B．a(chǎn) research report
C．a(chǎn) description of suicides  
D．a(chǎn)n introduction to a professor．

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源： 題型：填空題

4．He had learned to play threemusical（音樂(lè)的） instruments by the age of five．

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源： 題型：選擇題

11．One of the basic principles of wildlife protection involves _______ adequate natural food and shelter to maintain populations of each species in a given environment．（　　）
A．providedB．providingC．to provideD．provide

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源： 題型：選擇題

1．As the proverb says，"Fortune never helps the man _____ courage fails．"（　�。�
A．whoB．of whomC．of himD．whose

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源： 題型：選擇題

8．-What do you think of a volunteer？
-It's a difficult and stressful job but one         you can really help people．（　�。�
A．whereB．whenC．whichD．that

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源： 題型：完形填空

1．Leaping on a narrow balance beam（平衡木） is not easy．But Lola Walter，a 13-year-old gymnast，is an expert at it．
To make her skills perfect，Lola（11）D for four hours a day，five days a week．At the state championships in March，she finished seventh out of 16 girls．
That's especially impressive，（12）Ashe is almost blind，born with an unusual condition that makes her eyes unable to see properly．She often sees double an d can't （13）Chow far away things are．
When she was little，her mom （14）A that even though she couldn't see（15）B，she was fearless．So her mom signed her up for gymnastics when she was three．She loved the （16）C right away and gymnastics became her favorite．
Though learning gymnastics has been more （17）Bfor her than for some her teammates，she has never given up．She doesn't let her （18）D stop her from doing anything that she wants to．
She likes the determination it takes to do the sport．Her biggest （19）Ais the balance beam．Because she has double sight，she often sees two beams．She must use her sense of touch to help her during her practice．Sometimes she even closes her eyes．"You have to （20）C your mind that it'll take you where you want to go，"says Lola．
To be a top-level gymnast，one must be brave．The beam is probably the most （21）Afor anyone because it's four inches wide．At the state competition，Lola didn't fall （22）Cthe beam．In fact，she got 8.1 out of 10----her highest score ever．
Lola doesn't want to be （23）D differently from the other girls on her team．In the competition，the judges don't know about her sight （24）B．She doesn't tell them，because she doesn't think they need to know．Her mom is amazed by her（25）C  attitude．
Lola （26）A thinks about giving up．She is presently at level 7 while the highest is level 10 in gymnastics．Her （27）D is to reach level 9．She says she wants to be a gymnastics coach to pass down what she's learned to other kids（28）Bshe grew up．
Lola is  （29）Aof all her hard work and success．She says it's helpful her overcome problems in her life outside gymnastics，too．Her （30）Cfor others is"just believe yourself"．

11．A．runsB．teachesC．dancesD．train s
12．A．sinceB．unlessC．a(chǎn)fterD．though
13．A．talkB．guessC．tellD．predict
14．A．noticedB．rememberedC．imaginedD．doubted
15．A．deeplyB．wellC．a(chǎn)headD．closely
16．A．taskB．eventC．sportD．show
17．A．boringB．difficultC．enjoyableD．unsatisfactory
18．A．talentB．qualityC．natureD．condition
19．A．challengeB．a(chǎn)dvantageC．favorD．program
20．A．examineB．expressC．trustD．open
21．A．fearfulB．harmfulC．unfairD．inconvenient
22．A．toB．onC．offD．a(chǎn)gainst
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．a(chǎn)sD．before
29．A．proudB．tiredC．a(chǎn)shamedD．confident
30．A．planB．loveC．a(chǎn)dviceD．duty．

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源： 題型：選擇題

2．We hope the bridge       will he completed as soon as possible．We can't bear the inconvenience any more．（　　）
A．builtB．being builtC．to builtD．building

查看答案和解析>>

同步練習(xí)冊(cè)答案