题目内容

常用的脊髓兴奋药是尼可刹米

A. 对
B. 错

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尼可刹米为呼吸中枢抑制药，可抢救中枢兴奋药中毒。

A. 对
B. 错

He didn't go to the park with us _________he was very busy.

A. when
B. while
C. if
D. because

He'll never succeed,________hard he tries.

A. whatever
B. despite
C. thought
D. however

I passed his office several times_________I could make up my mind to ring the door bell.

A. then
B. until
C. before
D. but