When you ask the other person whether he or she is going on vacation, you can use the present continuous tense to have a future meaning.
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The question “Are you going on vacation this year?” in English sounds even more natural.
A. 对
B. 错
多数交感神经节后纤维释放的递质是:
A. 乙酰胆碱
B. 去甲肾上腺素
C. 胆碱酯酶
D. 儿茶酚氧位甲基转移酶
E. 单胺氧化胺
分布在骨骼肌运动终板上的受体是:
A. α-R
B. β-R
C. M-R
D. N N-R
E. N M-R
某受体被激动后,引起支气管平滑肌松驰,此受体为:
A. α-R
B. β1-R
C. β2-R
D. M-R
E. N-R
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