--I didn't do well in the exam.What about you?--I did ______

--I didn't do well in the exam.What about you?--I did _______ you.Maybe even wor

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磺胺药的抗菌机制是 (  ) 。

磺胺药的抗菌机制是 (  ) 。

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与巴比妥类比较,地西泮治疗失眠的优点是 (  ) 。

与巴比妥类比较,地西泮治疗失眠的优点是 (  ) 。

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已知向量a=(2,1),b=(3,-l),则a与b的夹角θ为_______。

已知向量a=(2,1),b=(3,-l),则a与b的夹角θ为_______。

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____________is the population of the city?

____________is the population of the city?

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