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【单选题】
This made herwonder whether traces of DNA lingered on cell phones一evenwhen no blood was___involved___A.
checked
B.
involved
C.
tested
D.
gathered
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举一反三
【单选题】－Mary, how did your Math test go? －I had thought I _________, but in fact I came in the top 10% in my class.
A.
should have failed
B.
couldn’t have failed
C.
might have failed
D.
shouldn’t have failed
【简答题】简述褪黑素的生理作用?
【简答题】请简述动物原料僵直状态下有哪些特点？
【简答题】playing the guitar