根据短文内容，从短文后的七个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。
What makes one person more intelligent than another? What makes one person genius, like the brilliant Albert Einstein, and another person a fool? Are people born intelligent or stupid, or is intelligence the result of where and how you live? ___________
We know, however, that just being born with a good mind is not enough. In some ways, the mind is like a leg or an arm muscle. __________ Mental exercise (done with the mind) is particularly important for young children. Many child psychologists think that parents should play with their children more often and give them problems to think about. ___________ If, on the other hand, children are left alone a great deal with nothing to do, they are more likely to become dull and unintelligent.
____________ According to some psychologists, if parents are always telling a child that he or she is a fool or an idiot (白痴), then the child is more likely to keep doing silly and foolish things. So it is probably better for parents to say very positive things to their children, such as “____________” or “You are such a smart child.”

A．It needs exercise.

B．Parents should also be careful what they say to young children.

C．These are very old questions and the answers to them are still not clear.

D．Child psychologists don’t believe it.

E. The children are then more likely to grow up bright and intelligent.
F. You must be careful what you are doing.
G. That is a very clever thing you did.