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    【题目】Years ago we didn’t know this, but recent science _____ that people who don’t sleep well soon get ill.
    A.showed
    B.has shown
    C.will show
    D.is showing

    【答案】B
    【解析】A. showed一般过去时；B. has shown现在完成时态；C. will show一般将来时；D. is showing现在进行时；句意：多年前我们不知道这些，但是现代的科学已经表明不能有好的睡眠的人会很快得病。强调现在的情况和结果，故选B。

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