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问题 单项选择题

肾上腺素散瞳的机制正确的是( )

A．阻滞副交感神经对瞳孔括约肌的兴奋作用
B．直接兴奋肾上腺素能α受体
C．直接兴奋肾上腺素能p受体
D．间接兴奋肾上腺素能受体
E．直接作用于中枢

答案

参考答案：C

完形填空

Linda is an English girl．She is twelve years old．She has two brothers. 1 are Jack and Jim.But she doesn’t  2 any sisters．

Linda goes to school by 3 . She usually  4 to school at eight o’clock. Thc first 5 starts at nine o’clock．She has five classes every day. Her favorite 6 are math and science. She has math from Monday  7 Friday.

On weekends, she  8 her brother with his homework at home. Sometimes she listens to music.She likes  9 very much. Her favorite musician is Liu Huan from China．She thinks his songs are very  10 .She likes them very much．

小题1:A. We       B. You    C．They

小题2:A. have     B. know    C.  find

小题3:A. radio    B. bus    C. watch

小题4:A. leaves    B. takes   C. gets

小题5:A. book      B. class     C. picture

小题6:A.subjects    B. clothes    C. colors

小题7:A. of        B.at         C. to

小题8:A．asks      B says       C. helps

小题9:A．dancing    B．singing    C. running

小题10:A．relaxing  B.  boring    C. difficult
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问答题 简答题

简述肺牵张反射的特点？
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