题目内容

[A] evolved
[B] enclosed
[C] engaged
[D] involved

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Which of the following best states the theme of the passage？
[A] There is no good news on AIDS.
[B] The total economic cost for AIDS patients is staggering.
[C] Nationwide efforts must be made to find a cure for AIDS.
[D] AIDS has a deep impact on American society

假定你从一新发现的病毒中提取了核酸。请用最简单的方法确定：①它是DNA还是RNA？②它是单链还是双链？

All of the following are parts of the Sun's atmosphere EXCEPT the
[A] corona.
[B] chromosphere.
[C] photosphere.
[D] core.

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