.I'm usually fairly doubtful about any research that concludes that people are either happ

.
I'm usually fairly doubtful 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, I 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 aged 9 to 17 exhibit a higher level of anxiety today than children who were treated for mental illness 50 years ago.
Why are America's kids so stressed? According to the report there are two main causes: increasing loneliness ─ brought on by high divorce rates and little communication with society, among other things ─ 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 handle such difficulties. At the top of the list is giving children a better appreciation of the limits of individualism (个人主义). No child is an island. Strengthening social ties helps protect individuals against stress. To help kids build stronger connections with others, you can pull the plug on TVs and computers. Your family will thank you later. They will have more time for face-to-face relationships, and they will get more sleep.
Limit the amount of virtual violence your children are exposed to. It's not just video games and movies; children see a lot of murder and crime on the local news. Keep your expectations for your children reasonable. Many highly successful people never attended Harvard or Yale. Make exercise part of your daily routine. It will help you deal with your own anxieties and provide a good model for your kids. Sometimes anxiety is unavoidable. But it doesn't have to ruin your life.
1. The author thinks that the conclusions of any research comparing people's state of mind today with people’s state of mind in the past are .
A. surprising B. confusing C. interesting D. questionable
2. What does the author mean when he says, “we can't turn the clock back” (Paragraph 3)?
A. It's impossible to slow down the pace of change.
B. The social reality children are facing cannot be changed.
C. Lessons learned from the past should not be forgotten.
D. It's impossible to forget the past.
3. According to the analysis, compared with normal children today, children treated as mentally ill 50 years ago .
A. had little communication with friends
B. were probably less self-centered
C. probably suffered less from anxiety
D. were considered less individualistic
4. The first and most important thing parents should do to help their children is .
A. to provide the children with a safer environment
B. to lower their expectations for the children
C. to get the children more active socially
D. to set an example for the children to follow
5. What conclusion can be drawn from the passage?
A. Anxiety, though unavoidable, can be dealt with.
B. Children's anxiety has been taken too seriously.
C. Children's anxiety can disappear with more parental care.
D. Anxiety, if properly controlled, may help children become mature.1—5 DBCCA

(答案→)1—5 DBCCA 解析：可联系答.案.网客服索取。

好好学习下

这个问题我还想问问老师呢

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C解析试题分析：本题考查减数分裂过程中染色体的变化。减数分裂：特殊的有丝分裂，形成有性生殖细胞 。实质：染色体复制一次，细胞连续分裂两次结果新细胞染色体数减半。