题目内容

将细菌培养在含有放射性物质的培养液中,使双链都带有标记,然后使之在不含标记物的培养液中生长三代,其结果是

A. 第一代细菌的DNA都带有标记
B. 第二代细菌的DNA都带有标记
C. 不出现两股链都带标记的子代细菌
D. 第三代多数细菌的DNA不带有标记
E. 其余选项都不对

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A. That's quite a story.
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D. There were quite a lot of people at his party.

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