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(   ) 15. Aron had to use his knife to        half his right arm to save his own life.

   A. cut in   B. cut down     C. cut out   D. cut off

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      Today,more and more people drive cars. Cars make our lives easier,but they also make problems. One of the biggest problems is air pollution (污染) because most cars use petrol (汽油). So the “green” cars will become popular. It means that there will be a few new kinds of cars that don't use petrol. Here are some of them:

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