题目内容
1.Antifreeze is a liquid(液体) that is added to water to keep it from freezing.When water freezes and turns to ice,it expands(膨胀).The force of water expanding is so great that it will break the hardest metal.Water is used in car engines(发动机) 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.
66.People useB to keep car engines cool.
A.antifreeze B.water C.alcohol D.ethylene glycol
67.The usual kind of antifreeze freezes atD.
A.0℃B.-18℃C.-22℃D.-40℃
68.We use antifreeze in order toC.
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
69.Besides alcohol,Bis another kind of popular antifreeze.
A.water B.ethylene glycol C.any chemical D.any mixture
70.The text is written toA.
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.
分析 这是一篇科普知识类阅读,短文主要介绍了Antifreeze是什么,首先,作者在文章的开头就给出了它的定义和具体的说明,然后又具体说明了Antifreeze的主要用途和作用.
解答 66 B 细节理解题.根据文中第一段中Water is used in car engines(发动机) to keep them cool while they run水用来汽车发动机运行时冷却下来.故选B.
67 D 细节理解题.根据文中第二段the usual kind of antifreeze will not freeze until the temperature is-40℃结冰一般的防冻剂直到温度为-40℃才会冻结.故选D.
68 C 理解推断题.根据文中第二段中Water freezes at 0℃;the usual kind of antifreeze will not freeze until the temperature is-40℃.水在零度才会结冰,一般种类的抗凝剂会直到零下40度才会开始结冰,可知抗凝剂的作用是降低了水的凝固点,故选C.
69 B 理解推断题.根据文中第三段中There are several chemicals that do this.One of the most popular is called ethylene glycol可知ethylene glycol也有与alcohol相似的作用,故选B.
70 A 主旨大意题.纵观全文,可知作者在文章的开头就给出了Antifreeze的定义和具体的说明:Antifreeze is a liquid(液体) that is added to water to keep it from freezing.然后又具体说明了Antifreeze的主要用途和作用,可知这篇文章使用来介绍什么是Antifreeze,故选A.
点评 首先要仔细阅读文章,掌握大意,然后结合具体的题目再读短文,从中找出相关的信息,就可以确定正确答案.
| A. | 1980s | B. | 1980's | C. | the 1980 | D. | the 1980s |
| A. | mustn't | B. | may not | C. | shouldn't |
| What is an e-reader?An e-reader is a small computer.It can hold thousands of e-books.So people want to throw away heavy schoolbags and read with small,light e-readers. For example,a US high school has put its paper books away.Teachers and students are using e-readers now."It's so convenient.You can have so many books right at your fingertips."said Meghan Chenausky,16. Chinese schoolchildren are also trying e-readers.Hanvon WISEreader is the most popular e-reader in China.It weighs about 260g and is as big as a regular textbook.It is a special e-reader.Students can make notes on it.They can use it to download textbooks from school computers.It can also send and receive homework. New e-readers are not just for reading.They have WI-FI(无线网络) and multimedia(多媒体).Parents think these may hurt children's study habits."I think WI-FI is not necessary for kids."says Zeng Wenwen,43,Beijing. |
51.An e-reader can keep thousands of e-books.T
52.An e-reader can help to make schoolbags lighter than before.T
53.In every US school,e-readers are used instead of paper textbooks.F
54.The passage mainly introduces the size of an e-reader.F
55.A different opinion is against the WI-FI and multimedia of e-readers.T.
| A. | teach himself to | B. | teach to himself | ||
| C. | learn by himself | D. | study with himself |