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问题 单项选择题

苯海索治疗帕金森症的作用机制主要是

A．激动黑质-纹状通路的多巴胺受体

B．抑制外周左旋多巴脱羧转变为多巴胺

C．促进中枢释放多巴胺

D．阻断中枢纹状体的胆碱受体

E．阻断外周的胆碱受体

答案

参考答案：D

填空题
根据短文内容，用方框所给单词的适当形式填空，每词限用一次。
they   subject   from   know  how
Many people go to school for a good education(教育). They learn languages, history, math, art and other ___81_____. School education is very important and useful, yet no one can learn everything ___82_____ school. No matter(不管) how much a teacher ____83____, he can’t teach his students everything they want to know. His work is to show his students ____84____ to learn. He teaches ____85____ how to read and how to think. So, much more is to be learned outside school by the students themselves.
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单项选择题

飞行中，航空活塞发动机电嘴的点火电能来自（）.

A.飞机电瓶

B.交流发电机

C.磁电机内的磁铁转子和线圈
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