3. The author mentioned the study in the last three paragraphs to indicate that　.

　　A. students should climb the steep hill with friends

　　B. it takes a long time to make friends

　　C. a friend in need is a friend indeed

　　D. people accompanied by friends remain optimistic in the face of difficulty

　　【解析】选D。推理判断题。倒数第二段中“The students who stood with friends gave lower estimates of the steepness of the hill. ”表明与朋友在一起的学生估计出来的坡度更小, 这意味着他们面对困难能保持相对乐观的心态。

　　4. In Paragraph 2 the author aims to tell us　.

　　A. friendship has a strong physical effect on people’s health

　　B. we cannot be too careful when making friends

　　C. older people are likely to have fewer friends

　　D. 60 percent of the people without friends will become fat when they get old

　　【解析】选A。段落大意题。根据本段开头(主题句)可知答案。而且主题句后的三个研究结论都与“友谊影响身体健康”有关。

　　（2016高考阅读理解）阅读下列短文，从每题所给的选项中选出最佳选项。

　　Americans think that travel is good for you.Some even think it can help with one of the country’s worst problems­crime(犯罪)．Crime worries a lot of people.Every year，the number of crimes is up and up.And many criminals are young.They often come from sad homes，with only one parent or no parents at all.

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