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问题 单项选择题

经口感染，幼虫必须经过宿主体内移行的线虫有：（）.

A.似蚓蛔线虫、毛首鞭形线虫

B.似蚓蛔线虫、住肠蠕形线虫

C.似蚓蛔线虫、钩虫

D.似蚓蛔线虫、旋毛形线虫

E.钩虫、毛首鞭形线虫

答案

参考答案：C

完形填空

Dear Sir,

I’m glad to recommend to you my student Li Ming.

Li Ming was born ____小题1:__ July 15,1974 in Xiamen. He studied in Datong Primary School from 1980. When he was in the m___小题2:__school, he did ___小题3:___ in maths, physics and chemistry and wasfond of art. After ___小题4:___(毕业) from No.6 High School, he entered Beijing University to s__小题5:____ physics. After four years of hard work there, he went to the United States for f__小题6:____ study. Because of his excellent work, he got a __小题7:_____(博士) degree in physics this year. He is now in good health and would __小题8:_____ to make contributions（贡献） to our country.

I should be most ___小题9:___(感激) if you would favorably consider my recommendation.

Looking forward to ___小题10:___ from you.
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单项选择题

晶闸管装置常用的过电流保护措施除了直流快速开关、快速熔断器、还有（）。

A、压敏电阻

B、电流继电器

C、电流检测的过电流继电器

D、阻容吸收
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