单项选择题

能直接透过细胞膜的激素称为（）激素。

A．类固醇
B．含氮
C．含糖
D．含脂

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单项选择题

5. US President Ronald Reagan has a convincing and heart-warming smile.

A、a persuasive
B、a factitious
C、a bewildering
D、an emphatic

Past perfect continuous tense is used to indicate an action that happened continuously in the past before something else occurred.
正确
错误

答案：正确