1. a
　　依据课文第一句话可以推断，只有a. Children can learn to swim much earlier than is commonly supposed (儿童可以在比通常人们想像的年龄更小的时候学习游泳)是课文所陈述的状况，而其他3个选择都与课文内容不符。所以选a.
　　2. b
　　依据课文第10行，只有b. Not all the children ride their tricycles during the underwater race (不是全部的孩子在水下竞赛中都骑三轮车)是课文所示意的情形，其他3个选择都与课文内容不符。
　　3. c
　　只有c. taught how to swim(被教如何游泳)与前一句的instructed in swimming (被教授游泳)意义一样，其他3个选择a. learn to swim(学游泳)，b. learnt swimming , d. learnt how to swim 都有“学游泳”的意义，都与instructed in swimming 意义不同，不符合题目意思，所以选c.
　　4. b
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