7.Although the causes of cancer ____， we do not yet have any practical way to prevent it.  

　　 A. are being uncovered B. have been uncovering

　　 C. are uncovering D. have uncovered

A


解析:

分析語境邏輯不難發(fā)現(xiàn)，該空表示“現(xiàn)在正在被揭示”，應(yīng)填現(xiàn)在進(jìn)行時(shí)被動(dòng)語態(tài)動(dòng)詞形式are being uncovered。

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【小題4】
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【小題5】
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【小題6】
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【小題7】
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【小題8】
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【小題9】
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【小題10】
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【小題11】
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【小題12】
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【小題13】
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【小題14】
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【小題15】
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