5. 答案

　　C

　　解析

　　细节理解题。依据文章最后一段中的help a child on the right path and set them straight可知，代养孩子可以使孩子们健康地长大。故选C项。

　　Ⅲ.七选五

　　根据短文内容，从短文后的选项中选出能填人空白处的最佳选项。选项中有两项为多余选项。

　　Exercise is one of the few factors with a positive role in long-term control of body weight. ___1___ Most Americans still would rather try switching to light beer and low-calorie bread than increase physical exercise. The Centers for Disease Control and Prevention, for example, found that fewer than one-fourth of overweight adults who were trying to shed pounds said they were combining exercise with their diet.

　　___2___ For example, one would have to walk three miles just to work off the 275 calories in one delicious Danish pastry (油酥糕点). ___3___ “Exercise by itself is a very tough way to lose weight,” says York Onnen, program director of the President’s Council on Physical Fitness and Sports.

　　___4___ A study at the Boston University Medical Center of overweight police officers and other public employees confirmed that those who dieted without exercise regained almost all their old weight, while those who worked exercise into their daily routine maintained their new weight.

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