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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？

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

C₀t_1/2与基因组复杂性相关。

The World Trade Center, the top ____________ was 410 meters high, was one of the tallest buildings in the world.
[A] which
[B] of which
[C] of whose
[D] that

[A] almost
[B] quite
[C]still
[D]yet