題目列表(包括答案和解析)
F. but in the TV series |
A.a(chǎn)ntifreeze | B.water | C.a(chǎn)lcohol | D.ethylene glycol. |
A.0℃ | B.-18℃ | C.-22℃ | D.-40℃ |
A.keep alcohol in water |
B.stop ice from becoming water |
C.make the freezing point of water lower |
D.raise the freezing point of water |
A.water | B.ethylene glycol | C.a(chǎn)ny chemical | D.a(chǎn)ny mixture |
A.tell us what antifreeze is |
B.make people buy antifreeze |
C.tell us that cars need antifreeze |
D.show us how to protect car engines |
B
If you want to find out a piece of information about anything , the best place to search for it is Wikepedia. This online encyclopedia is written by thousands of people around the world. Anyone can add or change the information if he or she finds it not correct or not well written. In this way, people who know a lot about a certain subject can write about it even if they are not university professors.
What is more, Wikepedia includes articles written in about 235 languages. This fact makes it one of the few websites (網(wǎng)站)on the Internet that are truly international. It was started in 2001 by Larry Sanger and Jimmy Wales, as a free online English-language encyclopedia project. By April 2008, over 10 million articles had been put on Wikipedia. A quarter of the articles are in English. Wikipedia is also a place where people can find the latest news.
However, Wikipedia has its own problems. There have been many complaints that some of the information on Wikipedia is not accurate and some important subjects are not included. This has led to arguments between the writers of articles. The people running Wikipedia say that the accuracy of the information is improving and that it is one of the top 20 visited websites on the Internet.
So, if you are looking for some information, why not try Wikipedia?
【小題1】Wikipedia is ___________.
A.a(chǎn) computer game | B.a(chǎn) name of a magazine |
C.a(chǎn) free university | D.a(chǎn)n online encyclopedia |
A.know much about a certain subject | B.likes writing different stories |
C.should be university professors | D.a(chǎn)re usually famous scientists |
A.everything is written in English |
B.the articles are in about 253 language |
C.there are over 10 million articles |
D.each writer can write in different languages |
A.watch interesting movies | B.send e-mail to friends |
C.read about the latest news | D.play exciting games |
Antifreeze is a liquid(液體) that is added to water to keep it from freezing. When water freezes and turns to ice,it expands(膨脹).The force of water expanding is so great that it will break the hardest metal.Water is used in car engines(發(fā)動機) to keep them cool while they run,and if this water is allowed to freeze in winter it can break the iron block of the engine.That is why antifreeze is necessary.
Water freezes at 0℃;the usual kind of antifreeze will not freeze until the temperature is-40℃.A mixture(混合物) of five parts of water and four parts of antifreeze will prevent freezing at-18℃;four parts of water and five parts of antifreeze reduce this to -22℃.
Alcohol is a kind of good antifreeze,but when the air is running it becomes hot and the alcohol boils away,so it must be changed very often.Most people use antifreeze that does not boil away when the engine is running.There are several chemicals that do this.One of the most popular is called ethylene glycol.
【小題1】people use ________ to keep car engines cool.
A.a(chǎn)ntifreeze | B.water | C.a(chǎn)lcohol | D.ethylene glycol. |
A.0℃ | B.-18℃ | C.-22℃ | D.-40℃ |
A.keep alcohol in water |
B.stop ice from becoming water |
C.make the freezing point of water lower |
D.raise the freezing point of water |
A.water | B.ethylene glycol | C.a(chǎn)ny chemical | D.a(chǎn)ny mixture |
A.tell us what antifreeze is |
B.make people buy antifreeze |
C.tell us that cars need antifreeze |
D.show us how to protect car engines |
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