抗心律失常药改变有效不应期(ERP)和动作电位时程(APD)从而减少折返的途径有 A

2010年是抗战胜利65周年。65年前的9月2日，日本签署投降书，宣告了中国抗成的最终胜利。硝烟已散，精神永存。抗战中迸发出的“精神”，主要是指      （   ）

①天下兴亡、匹夫有责的爱国精神                ②万众一心、共御外侮的大局意识

③百折不挠、愈挫愈奋的必胜信念                   ④不畏强暴、血战到底的英雄气概

A．①②③④

B．①②④

C．①②③

D．②③④

选择性培养基要选择融合的（）

A.瘤细胞与瘤细胞

B.脾细胞与脾细胞

C.脾细胞与瘤细胞

D.细胞多聚体

E.单倍体细胞

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 employment. Then they will no longer be below the poverty line.

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 of poverty

D. to show sympathy for those poor people

2. Which of the following is NOT true?

A. Ten percent of the Americans live a poor life.

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

决策支持系统是指辅助决策工作的一种计算机系统。（）

区域体层，系指照射角应小于

A．5°
B．10°
C．15°
D．20°
E．30°