“Sure，there's energy saving，but it's not worth much.It's a hot dog bun or a cup of milk's worth，”Paul Shaw of Washington University，who wasn't involved in the study above，says of many scientists' attitude toward the amount of calories the body saves during sleep.__12__

　　After staying up all night，volunteers burned about 28 fewer calories during a recovery sleep of eight hours than they had during a full night of regular sleep.__13__In the 24­hour period during which people caught up on missing sleep，they also burned about 228 fewer calories than during a comparable period in which they were sleep­deprived.Overall，when people slept normally，they burned 96 more calories than they did on days when they were making up for lost sleep.

　　A．The energy conservation didn't stop there.

　　B．The recovery sleep should be limited to eight hours.

　　C．He also said small differences could have large consequences.

　　D．Missing a night of sleep forces the body to burn more calories.

　　E．They found a full night of sleep helps the body preserve energy.

　　F．The amount of energy saving associated with sleep isn't little.

　　G．Therefore the team were able to calculate each person's energy use during the experiment.

　　答案　9.E　10.D　11.G　12.C　13.A

　　Ⅲ.短文改错

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