阅读材料，回答问题。 春节等中 * * 重大节日燃放烟花爆竹，是国人的传统习俗，然而

前列腺增生合并尿潴留时，不可应用（）

A.中药

B.西药利尿

C.针灸

D.抗生素

E.雌性激素

机动车仪表板上（如图所示）亮表示什么？（）

A．行车制动系统出现故障

B．驻车制动器处于制动状态

C．防抱死制动系统出现故障

D．驻车制动器处于解除状态

某热力管道的介质工作温度为800℃，为了节能及安全，其外设计有保温层，该保温层宜选用的材料有（）。

A．硅藻土

B．矿渣棉

C．硅酸铝纤维

D．泡沫混凝土

Farming was once the chief way of life in nearly every country. People cannot live without food, and nearly all their food comes from crops and animals raised on farms. Not many people farm for a living any more, but farming remains the most important work in the world.

Before the nineteenth century, the typical American family lived on a small farm. They raised pigs, cattle, sheep, chickens, and planted corn, fruits, garden vegetables, and wheat. Everyone worked long and hard, but the results were often poor. Families barely harvested enough food for themselves. This situation began to change during the last half of the 1800's and it changed remarkably(明显地) in the next century.

Scientific methods and labor-saving machinery have made farming increasingly productive. The development of improved plant varieties and fertilizers has helped double and even triple the production of some major crops. More scientific animal care and animal raising have helped increase the amount of meat and products that animals produce. At the same time, the use of tractors and other modern farm equipment has sharply reduced the need for farm labor.

As farming has become less important as a way of life in the United States, it has become more important as a source which offers materials to industry. Today's successful farmers are experts not just in agriculture but also in accounting, marketing, and finance. Farms that are not run in a similar way have great difficulty surviving.

1. We are told in the first paragraph about ____.

A. the history of farming                       B. the importance of farming  

C. the development of farming                  D. the changes of farming

2. Which of the following describes American farming before the 19th century?

A. Farmers didn’t work hard on their farms.  

B. Farmers used tractors to help them.

C. Farming was the main way of living for most people.

D. Farmers could supply materials to industry.

3. Crop production has increased greatly now thanks to all the following EXCEPT __.

A. scientific methods                 B. labor- saving machinery    

C. farmers’ hard work                 D. chemical fertilizers

4. Which of the following is NOT mentioned in the passage?

A. Traditional American farming.            B. The increase in the number of crops in the US.

C. Modern farming methods.                D. American farmers’ hard work.

5. The passage mainly talks about_____.

A. the advantages of American farming      B. the changes in American farming 

C. the situation of American farms          D. how rapidly farming has developed

最近发展区是指（）。