4. The passage is mainly about _______

　　A. a cheap way to get energy

　　B. the place of recycling plants

　　C. new ways of recycling wastes

　　D. the probability of city environment

　　答案：B

　　指导：结合全文和第二段可以作出判断。

　　***********************************************结束

　　I usually doubt about any research that concludes that people are either happier or unhappier or more or less certain of themselves than they were 50 years ago.While any of these statements might be true, they are practically impossible to prove scientifically. Still, 1 was struck by a report which concluded that today’s children are significantly more anxious than children in the 1950s. In fact, the analysis showed, normal children between 9 and 17 have a higher level of anxiety today than children who were treated for mental illness 50 years ago.

　　Why are America’s kids so stressed? The report cites two main causes: increasing physical isolation (孤独)

　　brought on by high divorce rates and less involvement in community, and a growing perception that the world is a more dangerous place.

　　Given that we can’t turn the clock back, adults can still do plenty to help the next generation to cope.

　　At the top of the list,nurturing (培育) is a better appreciation of the limits of individualism. No child is an island. Strengthening social ties helps build communities and protect individuals against stress.

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