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问题 选择题

下列物质能在氧气中燃烧，且生成白色固体物质的是（　　）

A．硫粉

B．木炭

C．镁

D．铁丝

答案

A、硫粉在氧气中燃烧，产生一种具有刺激性气味的气体，故选项错误．

B、木炭在氧气中燃烧，生成能使澄清石灰水变浑浊的气体，故选项错误．

C、镁在氧气中燃烧，生成一种白色固体，故选项正确．

D、铁丝在氧气中剧烈燃烧，生成一种黑色固体，故选项错误．

故选C．

单项选择题

In the United States and in many other countries around the world, there are four main ways for people to be (91) about developments in the news: newspapers, magazines, and radio or television news broadcasts. A person may use one, or all, of these (92) for information. Each source is useful in its (93) way. Newspapers and magazines can give much information about a particular event. They may (94) some history of the event, some of its (95) , some of its effects, or perhaps give an (96) or point of view on a particular development. Radio and television can help a person to be well informed about what is happening each day. It is also (97) to listen to radio or watch TV (98) do something else at the same time. Many people can listen to the news on their car radio while driving (99) . For the student of English as a foreign language, an English language newspaper may be the most helpful news source that will also (100) you practice in reading English.
Most daily English language newspapers are not very hard to find. They are interesting and helpful in many (101) . In some of them, you may be able to find news about your (102) country. You will find news and information about important national and international political (103) . (104) what you are interested in, you can probably find something in the newspaper about it. A(n) (105) in the newspaper may help you solve a problem. Other stories may be about good movies, concerts, or TV shows.
Usually, an English language newspaper has several (106) or parts. Each part of the newspaper (107) stories about different kinds of news. Some sections have a lot of advertisements which may be helpful if you want to save money. By reading the advertisements, you may find something you want (108) sale. Or you may find that two stories are advertising the (109) thing, but at one store the price is lower. Other sections may have (110) advertisements or have only a specific type of advertisement to interest the people.

A．expose

B．refer

C．leak

D．provide
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解答题
根据下面提供的信息，自己提出问题．
商店运进饮料150箱，第一天卖出
1
5
，第二天卖出
2
5
，其余的第三天全部卖出．
问题1：列式：
问题2：列式：
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