问题 选择题

下列不属于体循环生理意义的是(  )

A.把氧和营养物质运送给细胞

B.把动脉血变成静脉血

C.把细胞产生的二氧化碳等废物带走

D.把静脉血变成动脉血

答案

体循环是指血液由左心室进入主动脉,各级动脉,流经组织处的毛细血管网,再由各级静脉、上、下腔静脉流回右心房的循环;在体循环中,从左心室摄入主动脉的动脉血,流经组织处的毛细血管时,血液中的氧气进入组织细胞,组织细胞中的二氧化碳进入血液,这样,动脉血就变成了静脉血.因此在血液循环中,通过体循环后,血液的变化是由动脉血→静脉血.显然选项D不属于体循环生理意义.

故选:D.

选择题
阅读理解

阅读理解。

     In Western countries people have been using the installment plan since the first half of the twentieth

century. Today, a large number of families in Great Britain buy furniture, household goods and cars by

installments. In the U. S., the figure is much higher than in Great Britain, and people there spend over 10

percent of their income on the installment plan.

     The price of an article bought on installments is always higher than the price that would be paid by cash.

There is a charge for interest. The buyer pays one quarter or one third of the price as a down payment when

the goods are delivered to him. He then makes regular payments, weekly or monthly, until the full price is paid

up. The legal ownership of the goods remains with the seller until the final payment has been made.

     Installment buying has advantages and disadvantages. It can help couples with small incomes to furnish

their homes and start housekeeping. It increases the demand for goods, and in this way helps business and

employment. There is, however, the danger that when business is bad, installment buying may end suddenly,

making business much worse. This may result in a great increase in unemployment. If the people on the

installment plan lose their jobs, they will probably not be able to make their payments. If great numbers of

people are not able to pay their installment debts there is a possibility that businessmen cannot collect their

debts and will therefore lose money. If businessmen lose money or fail to make a satisfactory profit, it

becomes more likely to have a depression. This is why, in some countries, the government controls the

installment plan by fixing the amount of the down payment and installments to discourage people from

buying more than they can pay for on the installment plan.

1. Which of the following is NOT true about the installment plan?

A. A lot of British families use the installment plan.

B. More than 10 percent American families buy things on installments.

C. Americans depend more on installment than British people do.

D. Americans spend one tenth of their income on installment buying.

2. Goods bought on installments are more expensive than goods bought by cash because _____.

A. the buyer has to pay extra money as interest

B. the delivery of the goods charges extra money

C. the buyer has to pay a down payment

D. the service offered by installment plan charged extra money

3. What will happen to a buyer if he fails to make the full payment for an item bought on installments?

A. He might lose his job.

B. He will stop owning the item he has bought.

C. He will have to sell what he has bought.

D. He will go into debt.

4. The advantage of installment buying might include all the following EXCEPT that _____.

A. purchasing power is strengthened

B. employment might be increased

C. people develop a good habit of saving money

D. young couples are able to furnish their homes

5. In some countries, the governments control the installment plan to _____.

A. increase employment

B. avoid depressions

C. ensure that businesses make good profits

D. ensure that people can pay for what hey buy