6、[阅读理解]16. Paragraph➊ A. What a muscle consists of B. When we use our muscles C. How people think of muscles D. what kind of muscles we have E. why we have different muscles F. why we should smile rather than frown
7、[阅读理解]25.Smiling uses less energy than A. frowning B. a lot of fiber C. to digest food D. to function proper E. whenever we are happy F. whenever we do something
13、[阅读理解]21.Muscles don't have to be very big_____ A. frowning B. a lot of fiber C. to digest food D. to function proper E. whenever we are happy F. whenever we do something
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