题目内容：
请在(5)处填写正确答案。
A．That's why it's possible for two kids with the same height, but different weights. B．If you eat more calories than your body needs to use, you will gain too much weight.
C．Poor eating and exercise habits also run in families and this may be the reason the members of a family are overweight.
D．However, many overweight people have difficulty reaching their healthy body weight.
E．On the other hand, if you eat less and exercise more, you may lose weight.
F．If both your parents are fat, there is a good chance you' be fat.
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答案解析：