【单选题】【消耗次数：1】
_______every week for several hours is good to keep healthy.
①
Exercise
②
To exercise
③
Should exercise
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相关题目
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I almost spent two hours on this exercise. Find any misplaced modifier in the sentence.
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two
②
almost
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【多选题】
A: How often do you usually exercise?B:_______________ .
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Every morning
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19. _______hand in his exercise book before Monday.
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Need he to
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③
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many
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A study suggests that even ____ exercise may lead to reduced iron in the blood of women.
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modern
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【单选题】
17．胎儿心血管的结构是
①
A．房间隔有卵圆孔及其瓣膜
②
B．主动脉和肺动脉之间有动脉导管连通
③
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④
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