2. 外语
  3. Twenty minutes of (vigorous) exercise every day is very (effect) in (helping) a person to (maintain) physical fitness.

Twenty minutes of (vigorous) exercise every day is very (effect) in (helping) a person to (maintain) physical fitness.

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问题 Twenty minutes of (vigorous) exercise every day is very (effect) in (helping) a person to (maintain) physical fitness.
选项 A、vigorous
B、effect
C、helping
D、maintain
答案B
解析
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