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【判断题】
DNA的Tm值和A-T含量有关,A-T含量高则Tm高A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】You _____ cross the road when the traffic lights are red. It's dangerous. [ ]
A.
needn't
B.
may not
C.
mustn't
【单选题】You should be __________ when you cross the street.
A.
quiet
B.
easy
C.
careful
D.
hard
【单选题】You ______ cross the road when the traffic lights are red. It’s dangerous. A. n
A.
You ______ cross the road when the traffic lights are red. It’s dangerous. A. needn’t
B.
may not
C.
mustn’t
【单选题】You _____ be careful when you cross here --- the traffic lights aren’t working.
A.
could
B.
might
C.
ought to
D.
may
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