答案：B

　　4.解析：标题概括题。通读全文可知，本文属于议论文，第一段是中心段，提出了作者的观点，即母女关系不同于友谊关系。其余各段分别从不同角度论证了这个观点。因此答案选D项，与文章中心一致。A、B、C三项都不是文章的主要内容。

　　答案：D

　　B

　　PALO AITO, California－“Switching off the television may help prevent children from getting fatter－even if they do not change their diet or increase the amount they exercise，” US researchers said last week.

　　A

　　study

　　of 192

　　third and

　　fourth

　　grades students, generally aged eight and nine, found that children who cut the number of hours spent watching television gained nearly two pounds (0. 91 kg) less over a one­year period than those who did not change their television diet.

　　“The findings are important because they show that weight loss can only be the result of a reduction in television viewing and not any other activity，” said Thomas Robinson, a pediatrician (儿科专家) at Stanford University.

　　“American children spend an average of more than four hours per day watching television and videos，and rates of childhood being very fat have doubled over the past 20 years，” Robinson said.

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