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问题 单项选择题 A1/A2型题

我国雨水洪水型钩端螺旋体病的主要病原是（）。

A.黄疸出血群

B.波摩那群

C.七日热群

D.犬群

E.秋季热群

答案

参考答案：B

解析：猪携带波摩那群钩体，可引起雨水型和洪水型流行，犬携带犬型，也是雨水型和洪水型的病原体。

选择题

取一段燕麦幼苗茎放在一定浓度的植物生长素水溶液中培养，结果如图所示。幼苗茎段重量增加的主要原因是

[ ]

A．水分增加

B．糖类增加

C．蛋白质增加

D．无机盐增加
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单项选择题

The process of gaining or losing weight can be explained by comparing your body to your car. Both run (51) fuel, food for your body and gasoline for your car. Both (52) that fuel, first into heat, then energy, some of (53) is used to do work, and some emitted as waste. And (54) your car uses more energy when the engine is racing than when it is idling, (55) does your body use more energy when you are working hard than (56) you are resting.

For the purpose of this comparison, (57) , there is one significant difference between them. Your car cannot store fuel by turning it into (58) else; all gasoline not (59) remains as gasoline. But your body stores (60) energy as fat. When the gas tank is completely empty, the car won’t run; but your body can burn fat to provide more energy.

60().

A.useless 

B.enough 

C.excess 

D.extensive
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