Cars play an important role in modern life, but they_______also cause many problems like air pollution．

       A．should     B．can   C．must        D．Will

B


解析:

考查情態(tài)動(dòng)詞。這里的肯定句表示“有時(shí)會(huì)，可能會(huì)”，用can。注意can與must都能用于肯定句中表示肯定的推測(cè)與判斷，表示具體情形的推測(cè)判斷用must，而can表示一般性的敘述，“有時(shí)會(huì)”。

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In many parts of the world，cars play an important role in daily life and many societies would not exist without them. So the idea that in 20 years’ time, no one will own cars may be hard to believe. But this is the prediction made by a team of transport researchers who are taken seriously, not only by government but also by car manufacturers.
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【小題1】 We know from the passage that governments and car manufacturers        .

   A. do not believe the prediction that no one will own cars by 2020
   B. are devoted to the technological revolution in car industry
C. consider the predictions seriously
   D. have put the super-intelligent car into mass production
【小題2】 Which of the following will be the characteristic of the cars of 2020?
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D. Cars will produce more pollution than present ones．
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A. cars play a very important role in daily life
B. many societies would stop functioning without cars
C. cars should not be owned by one individual
D. it causes many deaths to human society
【小題4】The expression closest in meaning to the phrase “in convoy” in the last paragraph is        .
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C. side by side     D. shoulder to shoulder
【小題5】 What will happen if cars are joined to each other electronically in 2020？
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