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问题 解答题

商店运来2400千克的白菜，卖了一些后，还剩250千克，卖了多少千克白菜？（列出含有未知数x的等式，再解答）

答案

设卖了x千克白菜

2400-x=250

x=2400-250

x=2150．

答：卖了2150千克白菜

单项选择题

Visitors to this country are normally admitted for six months, but foreign students can usually stay for one year. They must (52) an educational institution, and they are required to study for a (53) of fifteen hours a week on a daytime course. Prospective students have to show that they can afford their studies, and that they have sufficient (54) resources to support themselves (55) in this country.

In order to work here the foreigner needs a work permit, (56) must be applied for by his prospective employer. The problem here is that the Department of Employment has the right to grant or (57) these permits, and there is little that can be done (58) it; it would be extremely unwise for a foreign visitor to work (59) a permit, since anyone doing so is liable to immediate deportation (驱逐出境). There are some people from the European countries, who are often given (60) residence permits of up to five years. Some other people, such as doctors, foreign journalists, authors and others can work without permits, and foreign students are normally allowed to (61) part-time jobs while they are studying here.

55().

A.it 

B.what 

C.that 

D.which
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多项选择题

促使全科医学产生的背景包括

A．人口的迅速增长与老龄化

B．人群疾病普与死因普的变化

C．医疗费用的高涨

D．健康观的变化

E．人们经济收入的提高
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