在目前的信息网络中，（）病毒是最主要的病毒类型。C
A.引导型
B.文件型
C.网络蠕虫
D.木马型
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（4分）已知NA为阿伏加德罗常数，如果a g某气体中含有该气体的分子数为b，则该气体的物质的量为 ，若c g该气体在标准状况下的体积为 。（上述两空请用字母NA a b c表示）
根据《通信局（站）防雷与接地工程设计规范》，接地体采用扁钢时，其搭接处的焊接长度应为（）。
A.宽边的2倍
B.厚边的2倍
C.宽边的3倍
D.厚边的3倍
经产妇，孕3产2，无难产史，孕39+2周，3小时前开始规律宫缩。急诊检查：宫缩持续45秒，间隔3分钟，胎心140次/分，头位，宫口开4cm，羊膜囊明显突出，骨盆检查正常。此时最恰当的处理是
A．立即住院待产
B．破膜后住院
C．灌肠以促进产程，减少污染
D．急送产房消毒接生
E．急诊室留观
阅读理解
The poverty line is the minimum income that people need for an acceptable standard of living. People
with incomes below the poverty line are considered poor. Economists study the causes of poverty in
order to find solutions to the problem.
As the general standard of living in the country rises, the poverty line does, too. Therefore, even with
today's relatively high standard of living, about 10 percent of the people in the United States are below
the poverty line.However, if these people had stable jobs, they could have an acceptable standard of
living. Economists suggest several reasons why poor people do not have jobs.
For one thing, more than half of the poor people in the United States are not qualified to work. Over
40 percent of the poor people are children.By law, children less than 16 years old cannot work in many
industries. A large number of poor people are old. Many companies do not hire people over 65 years
old, the normal retirement age.
Some poor adults do not look for jobs for a variety of personal reasons: they are sick, they do not
have any motivation, they have family problems, or they do not believe that they can find a job.
Other poor people look for a job but cannot find one. Many poor adults never went to high school.
Therefore, when they look for jobs, they have few skills that they can offer.
At the present time, the government thinks it can reduce poverty in the country in the following ways.
First, if the national economy grows, businesses and industries hire more workers.Some of the poor who
are qualified to look for jobs may find employme
Second, if society invests in the poor, the poor will become more productive.If the government spends
money on social programs, education, and training for poor people, the poor will have the skills to offer.
Then it is more likely that they can find jobs.
Finally, if the government distributes society's income differently, it raises some poor people above
the poverty line. The government collects taxes from the non－poor and gives money to the poor. These
payments to the poor are called welfare. In 1975 over 18 million people in the United States received
welfare.
Some economists are looking for better solutions to the poverty problem. However, at the present
time, many people depend on welfare for a minimally acceptable standard of living.
1. The author's main purpose to write this article is________.
A. to define what the poverty line is
B. to explain why some people live the poverty line
C. to find solutions to the problem
D. to show sympathy for those poor people
2. Which of the following is NOT true?
A. Ten pe
B. Poor people are those who live below the poverty line.
C. The poverty line rises as the general standard of living rises.
D. The poverty line tends to be at the same level.
3. More than 40 percent of the poor people are children. This is mainly because________.
A. they do not have enough motivation
B. they are so young that they don’t have the right to work
C. they fail to get enough education
D. they are very poor in health
4. Most of the American poor people are not qualified for employment because________.
A. they do not have any motivation to work
B. they are not very self－confident
C. they are too young or too old to work
D. they have physical and family problems
5. We may concluded from the passage that________.
A. better solutions to the poverty problem are not yet found
B. welfare will enable them to be rich
C. poor people are sure to go out of the poverty line if they have chances to do business
D. employment is the best solution to the poverty problem
同一根钢筋在35d长度中，最多允许有（）焊接接头。
A、1个
B、2个
C、3个