单选题
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.
单选题
A. in B. on C. for D. against
【正确答案】
B
【答案解析】[解析] on表示依靠，“run on”为固定搭配。
单选题
A. convert B. use C. for D. burn
【正确答案】
A
【答案解析】[解析] convert与into搭配，是将sth．转化为sth．的意思。
单选题
A. what B. which C. it D. them
【正确答案】
B
【答案解析】[解析] 只有B选项可用与非限定性定语从句，来代表前边的先行词，其余三项均不可。
单选题
A. whereas B. although C. just because D. just as
【正确答案】
D
【答案解析】[解析] D项的意思是“正像……”“正如……”与上下文相衔接。
单选题
A. as B. so C. why D. how
【正确答案】
A
【答案解析】[解析] As正如……一样，作者拿汽车与人体做比较，由上题也可推出。
单选题
A. that B. since C. when D. where
【正确答案】
C
【答案解析】[解析] 由此空格前边的“when you are working hard”可知所对应的也应该是“when”。
单选题
A. however B. therefore C. moreover D. likewise
【正确答案】
A
【答案解析】[解析] 联系上下文，由人体与汽车的相同，说到不同，此应表转折关系。
单选题
A. everything B. nothing C. something D. anything