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问题 选择题

已知p、q是两个实数，如果pq=0，那么下列说法正确的是（　　）

A．p=0

B．q=0

C．p、q中至少有一个0

D．p=0且q=0

答案

∵pq=0，∴p=0或q=0．故选C．

判断题

替代互换存在的风险包括全部利率正向变化。（）
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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.

53().

A.what 

B.which 

C.it 

D.them
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