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填空题英语四级

2008-11-10

When you perform aerobic activities you　9　contract large muscle groups such as your legs and arms.

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【解析】选[L]。空所在句的句子结构完整，此处应填副词修饰动词，故[L]repeatedly和[O]obviously入选。由下文提到的walking，running，swimming，dancing，and jumping等可推知在这些有氧运动中四肢的活动是反复的，故答案为[L].

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