问题
单项选择题 B1型题
病原菌在一定条件下侵入机体，与机体相互作用，并产生病理生理过程称为感染或传染，其中“有少数细菌在正常情况下，寄生于人体内，不引起疾病。当机体免疫力减低时，造成的感染”属于（）
A.隐性感染
B.显性感染
C.带菌状态
D.外源性感染
E.内源性感染
答案
参考答案：E
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病原菌在一定条件下侵入机体，与机体相互作用，并产生病理生理过程称为感染或传染，其中“有少数细菌在正常情况下，寄生于人体内，不引起疾病。当机体免疫力减低时，造成的感染”属于（）
A.隐性感染
B.显性感染
C.带菌状态
D.外源性感染
E.内源性感染
参考答案：E
Some day little cars may take the place of (代替) today’s cars. They are good for our earth. If everyone 26 such a little car in the future, there will be 27 pollution in the air. There will be more parking places in the cities, and the street will be 28 crowded(拥挤). Now the space for one car of the usual size can hole more than one such little car. Driving will be 29 , because these little cars can go only 50 kilometers one 30 . The future cars will be fine for going around the city, but they will not be 31 for going far away. The little car needs only two batteries(电池), 32 battery for the motor, and the other for the horn(喇叭) and the lights. If we still 33 the big cars along with the small ones; we will need to 34 two kinds of roads. Some roads will be used for the big fast cars, 35 other roads will be needed for the smaller and slower ones.
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