气随血脱的生理基础是A．气能生血 B．气能行血 C．气能摄血 D．血能载气 E．血能

She ______ be a Canadian because she's got a British passport.

A．can't

B．isn't able to

C．mustn't

D．doesn't need to

阅读理解

     I'm usually fairly skeptical 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? The report cites two main causes: increasing physical

isolation(隔离) brought on by high divorce rates and less involvement in community, among other

things and a growing perception that the world is a more dangerous place.

Considering that we_can't_turn_the_clock_back,_adults can still do plenty to help the next generation.

     At the top of the list is nurturing(培育) a better appreciation of the limits of individualism. No

child is an island. Strengthening social ties helps build communities and 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 facetoface relationships, and they will

get more sleep.

    Limit the amount of virtual(虚拟的) 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 cope 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. According to the analysis, compared with normal children today, children treated as

    mentally ill 50 years ago ________.

A. probably suffered less from anxiety

B. were considered less individualistic

C. were less isolated physically

D. were probably less selfcentered

2. What does the author mean by saying "we can't turn the clock back" in the third paragraph?

A. It's impossible to forget the past.

B. The social reality children are facing cannot be forgotten.

C. It's impossible to slow down the pace of change.

D. Lessons learned from the past should not be forgotten.

3. The author thinks that the conclusions of any research about people's state of mind are ________.

A. illogical  

B. confusing

C. surprising  

D. questionable

4. Which of the following statements is TRUE according to the passage?

A. To children, anxiety is completely avoidable.

B. TV and computer play an important role in isolating children from the real world.

C. Exercise does not help to lessen children's anxiety.

D. Sometimes local news about crime and murder also affects children a little.

5. The first and most important thing parents should do to help their children is________.

A. to lower their expectations for them

B. to set a good model for them to follow

C. to get them more involved socially

D. to improve them with a safer environment

纺织纤维具有一定的（），包括强伸度，弹性，弯曲和扭转等性能。

A.力学性能

B.抱合力

C.染色性

D.化学稳定性

较适合于使用砂石桩处理的软弱地基有( )。

A．正常固结的淤泥

B．素填土、杂填土

C．松散砂土、黏性土地基

D．淤泥质土

追求时髦的青年男女是下列哪种消费心理的主要群体（）

A.求美心理

B.求新心理

C.攀比心理

D.猎奇心理