【題目】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一般過去時；B. has shown現(xiàn)在完成時態(tài)；C. will show一般將來時；D. is showing現(xiàn)在進(jìn)行時；句意：多年前我們不知道這些，但是現(xiàn)代的科學(xué)已經(jīng)表明不能有好的睡眠的人會很快得病。強(qiáng)調(diào)現(xiàn)在的情況和結(jié)果，故選B。

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