【吃透考点】2014年中考最后一冲 题型专练:任务型阅读(含答案)
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Everyone feels tired at one time or another. The office worker feels tired after a hard day at work. The sportsman feels tired after hours of physical training.
(1)_________ The explanation is that when you exercise a muscle in your body over and over again, something known as fatigue toxins (疲劳毒素) is produced. The blood system then carries these toxins throughout the body. In the end, not only does that muscle feel tired but the whole body feels tired as well.
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