全口义齿修复与固位有关的因素，下列哪一项是错误的（） A.牙槽骨致密程度 B.口腔黏

脑脊液中的Ig水平与血清的Ig水平成正比()

某市欲了解该地区的常住人口HBsAg携带状况，宜选用下列哪种调查方法进行乙型肝炎患病率调查（）

A.个例调查

B.前瞻性调查

C.抽样调查

D.暴发调查

E.回顾性调查

罗经点方向NW/N换算成圆周方向为（）。

A．303°.75

B．315°

C．326°.25

D．337°.5

阅读理解。

       With the development of science and technology, most of us will comment: "Life is speeding up.

Everyone is getting unwell."

     This may sound like something someone would say today. But in fact, an unknown citizen who lived

in Rome in 53 AD wrote it.

     We all love new inventions. They are exciting, amazing and can even change our lives. But have all

these developments really improve the quality of our lives?

     Picture this, you're rushing to finish your homework on the computer. Your mobile phone rings, a

QQ message from your friend appears on the screen, and the noise from the television is getting louder

and louder. Suddenly the computer goes blank and you lose all your work. Now you have to stay up all

night to get it done. How calm and happy do you feel?

     Inventions have speeded up our lives so much that they often leave us feeling stressed and tired. Why

do you think people who live far away from noisy cities, who have no telephones, no cars, even no

electricity often seem to be happier? Perhaps because they lead simpler lives.

     One family in the UK went "back in time" to see what life was like without all the inventions we have

today.

     The grandparents, with their daughter, and grandsons Benjamin, 10, and Thomas, 7, spent nine weeks

in a 1940s house. They had no washing machine, microwave, computer or mobile phones. The grandmother,

Lynn said,"It was hard physically, but not mentally." She believed life was less materialistic. "The more

things you have the more difficult life becomes." She said. The boys said they found less to fight over, such

as their computer. Benjamin also noticed that his grandmother had changed from being a"trendy,

beer-drinking granny to one who cooked things". Here are some simple ways to beat the stress often caused

by our inventions!

     ●Don't be available all the time. Turn off your mobile phone at certain times of the day. Don't check your

emails every day.

      ●Make sure you spend some time talking to your family. Set aside one evening a week when you don't

turn on the television. Play cards and chat instead.

     ●Get a low-tech hobby. Every day,do something in the old-fashioned way,such as walking to have a

face-to-face meeting instead of using the email or telephone.

     ●Don't worry too much about life-laugh more!

1. The passage is mainly about _____.

A. the important roles technology plays in our everyday life

B. improvements of our life with technology

C. problems with technology

D. major changes are likely to happen to technology

2. The writer uses the quote at the beginning of the story to _____.

A. point out that you experience some big problems and they may be the same

B. tell us what life was like long time ago

C. make us wonder what causes such a thing to happen

D. share a truth about life

3. Why did the family choose to spend some time in a 1940s house?

A. Because they were curious about how people lived without modern inventions.

B. Because they liked to live simple lives.

C. Because they were troubled by modern inventions.

D. Because living in a different time would be a lot of fun for them.

4. What does the underlined word "available" in the first suggestion offered by the writer mean?

A. Busy on line.

B. Free.

C. Be able to move.

D. Be found by others.

5. The writer may support that ______.

A. you ring back your boss immediately when you get home and see his message to you.

B. you take your iphone and taptop and power them on all the time while traveling.

C. you find fun in some exercise like hiking and jogging instead of chatting on the Internet.

D. you check your mail account as frequently as you can.

设有以下语句：
int a=1，b=2，c；
c=a^(b＜＜2)；
执行后，C的值为______。

A) 6
B) 7
C) 8
D) 9