A、At least 20 minutes a day. B、Less than 20 minutes a day. C、Exactly 20 minutes a day. D、More than 20 minutes a day. A

admin2010-06-11  47

问题  

选项 A、At least 20 minutes a day.
B、Less than 20 minutes a day.
C、Exactly 20 minutes a day.
D、More than 20 minutes a day.

答案A

解析
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