题目内容

黄体酮分子结构中具有:()

A. α-醇酮基
B. 酚羟基
C. 甲酮基
D. 氨基嘧啶环
E. 内酯环

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Later on, I will give an ___ to illustrate this point.

A. instance
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C. case
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I ____ Bob yesterday on main street.

A. ran after
B. ran against
C. ran into
D. ran away

Your free time activities can be a clue ____ your true interests.

A. for
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