根据短文的内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Jealous of the kids at school who are smarter than you and seem to learn more quickly? Don’t worry. 【小题1】
【小题2】 However, according to a recent study, IQ can rise—not just by one or two points, but by as many as 21 points!
Scientists have found that IQ changes are linked to changes in part of the brain called gray matter, which was seen to grow and bee denser（更加密集）in the brains of people whose IQs improved greatly.
【小题3】 One is to train your short-term memory. Previous research has proven that short-term memory is the basis for intelligence, so trying to recognize or retell something that you have seen or heard can help raise your overall brain power. 【小题4】
A good night’s sleep will also help improve your concentration. 【小题5】 It helps you stay focused for longer the next day.
Scientists have also found that exercise helps. Walking 30 minutes a day five times a week and doing exercise will help you bee more knowledgeable—as well as healthier and fitter.A．There are several ways of increasing your brain’s gray matter.B．Your brain deals more efficiently with things you truly like.C．With a bit of brain training, the chances are that you can be as smart as they are.D．So maybe it’s a good idea to get your brain in training right away.E. Getting enough sleep is like pushing the reset button in your brain.
F. The more you work on it, the better you will bee.
G. People used to assume that a person’s IQ was unchangeable.C
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(答案→)C
解析：本文是关于提高人的智商的脑力方面的训练方法。
【小题1】本文是关于学习方面的脑力训练，能让你和那些充满的孩子一样聪明。故C项符合上下文。
【小题2】根据本段IQ can rise—not just by one or two points, but by as many as 21 points!智商可能会有21分的变化，说明以前人们认为智商可能是不变的。故G正确。
【小题3】根据本段第一句One is to train your short-term memory．说明本文是关于提高大脑灰质的方法，故A符合上下文。
【小题4】根据上句要求我们要多尝试记忆你所看到的或者你所听到的，那样会提高你的脑力。那么这一句就应该是鼓励你尽量多做这样的练习，故F符合上下文。
【小题5】根据上句，充足的睡眠也会帮助提高我们的注意力，故E项中关于睡眠的说法符合上下文。