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【单选题】
下列关于遗传物质的说法正确的是
A.
DNA分子结构的多样性取决于4种碱基配对方式的多样性
B.
噬菌体侵染细菌的实验除证明DNA是遗传物质外，还说明了DNA能进行自我复制
C.
细胞的遗传物质是DNA，细胞的遗传物质是RNA
D.
虽然艾弗里与赫尔希等人的实验方法不同，但他们最关键的实验设计思路都是取微生物为实验材料
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【单选题】Questions 3 and 4 will be based on the following news item.
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C.
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D.
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To carry out a scientific survey.
B.
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D.
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【单选题】Questions 3 and 4 are based on the news report you have just heard.
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To encourage late marriage.
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To increase working efficiency.
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