Had it been possible I would have gone to the movies but I _____ busy.

  A. had been   B. am   C. was  D. would be

C


解析:

  but前的句子是一個(gè)與過去事實(shí)相反的虛擬語氣， but后引出了一個(gè)過去事實(shí),說明不去看電影的理由。故用一般過去時(shí)。

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Honeybees are disappearing for unknown reasons around the United States．Last winter, bees disappeared from 23 percent of American beekeeping businesses．Causes of the phenomenon, however, have remained a mystery．

       Now, scientists from several universities and the United States Department of Agriculture say they have a possible explanation for the bee decline（數(shù)量下降）．It is a little known virus called Israeli acute--paralysis virus （IAPV） ．The virus kills bees．Researchers in Israel first described it in 2004 , but until now, bee experts hadn’t paid much attention to it．

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       Studies of the presence of IAPV, however, showed more interesting information．In those studies, done by a team at Pennsylvania State University in University Park, the virus showed up in 83 percent of samples from colonies with symptoms （癥狀）．Only five percent of samples from symptomless colonies had it．

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       A．hasn’t attracted much attention

       B．well-known to doctors and scientist

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       B．How IAPV came to America．

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Honeybees are disappearing for unknown reasons around the United States．Last winter, bees disappeared from 23 percent of American beekeeping businesses．Causes of the phenomenon, however, have remained a mystery．
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       A．hasn’t attracted much attention

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       C．was first found by Austrian researchers

       D．is dangerous to animals and human beings

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       B．there must be something that is the real cause

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       A．How and why to kill IAPV．

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       A．hasn’t attracted much attention

       B．well-known to doctors and scientist

       C．was first found by Austrian researchers

       D．is dangerous to animals and human beings

2．The underlined sentence in the fifth paragraph probably means______．

       A．the virus could also cause other damages

       B．there must be something that is the real cause

       C．IAPV is not the only cause for the bee decline

       D．the virus may be caused by the polluted environment

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       A．calculating          B．comparing          C．examining        D．investigating

4．What still remains unknown to American scientists according to the passage?

       A．How and why to kill IAPV．

       B．How IAPV came to America．

       C．Whether bee products should be imported．

       D．How to change the rules of the bee products trade．

5．The best title for this passage would be _____．

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