题目内容

下列关于DNA分子中碱基组成关系不正确()

A+C=G+T
B. C=G
C. A=T
D. C+G=A+T
E. A+G=C+T

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不参与DNA组成的是:

A. dAMP
B. dGMP
C. dCMP
D. dUMP
E. dTMP

Canada is a country rich in natural __________ .

The travelers walked upstream until they reached the _________ of the river.

So far there has been no response from official __________.

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