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问题 单项选择题

对外贸易在各国经济生活中的地位和作用不断提高。根据联合国的有关统计，1970年世界各国出口总额占全球国民生产总值的11.4%，1980年增加到14.1%，1990年增加到16.2%，2000年则达到20%。对这段话理解正确的一项是( )

A．世界各国之间经济往来和经济依赖在不断加强

B．发达国家与发展中国家的国际分工正在从垂直型分工向水平型分工发展

C．各国经济往来的不断加强使各国的政治交往也更加频繁

D．在经济的发展过程中，外国资本、技术、管理水平等各方面的作用变得越来越重要

答案

参考答案：A

判断题

按国际贸易惯例的有关规定，在国际货物买卖中，货物所有权和风险将同时从卖方转移至买方。（）
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单项选择题

When a disease of epidemic proportions threatens the public, scientists immediately get to work, trying to locate the source of affliction and find ways to combat. Vaccination is one of the effective ways to protect the (1) population of a region or country which may be (2) grave risk. The process of vaccination allows the patient’s body to (3) immunity to the virus or disease so that, if it is encountered, one can fight it (4) naturally. To accomplish this, a small weak or dead (5) of the disease is actually injected into the patient in a controlled environment, (6) his body’s immune system can learn to fight the invader (7) . Information (8) how to penetrate the disease’s defenses is (9) to all elements of the patient’s immune system in a process that occurs naturally, in which genetic information is passed from cell to cell. This makes sure that (10) the patient later come into contact with the real problem, his body is well equipped and trained to (11) with it, having already done so before.

There are, however, dangers (12) in the process. (13) , even the weakened version of the disease contained in the vaccine proves (14) much for the body to handle, resulting in the immune system (15) , and, therefore, the patient’s death. Such is the case of the smallpox vaccine, (16) to eradicate the smallpox epidemic that nearly (17) the whole Native American population and killed massive numbers of settlers. (18) 1 in 10,000 people who receive the vaccine (19) the smallpox disease from the vaccine itself and dies from it. Consequently, the process, which is truly a (20) , may indeed hide some hidden curses.

19（）

A.infects

B.affects

C.effects

D.contracts
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