2011漳州英语PLC培训班PLC培训学校,及参考PLC考证培训

　C
　　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 rce 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 use ________ to keep car engines cool.
　　A. antifreeze  B. water  C. alcohol  D. ethylene glycol
　　67. The usual kind of antifreeze freezes at ________.
　　A. 0℃  B. －18℃  C. －22℃  D. －40℃
　　68. We use antifreeze in order to ________.
　　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，________ is another kind of popular antifreeze.
　　A. water  B. ethylene glycol  C. any chemical  D. any mixture
　　70. The text is written to ________.
　　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

　　Tears come out of my eyes when I talk to my parents on the phone. __71__ This is what I want to know most. I have supper at 5 o'clock in the dining room. Now it is the busiest time for my parents. Dad woks from seven o'clock in the morning to nine o'clock in the evening，so all the housework is left to my Mum. __72__ Every day she gets up at 4 o'clock in the morning，and then works till dark.
　　I promise her to study hard in the university because I am her hope. __73__ I just want her to promise me that she can take care of herself and my dad because they are just like the blood in my body.
　　In my family，everyone is equal. We are very happy to have meals together. Mum says that the happiest time for Dad and her is to see my sister and me come back home. We play cards in the room，watch TV and do anything we like，with Dad and Mum preparing delicious food in the kitchen. __74__ I forget all the difficulties and unhappiness at that time. The only thing I would like to do is to enjoy the time with my parents.
　　__75__ Love your parents as they love us. Give them a call，telling them you love them and miss them.
　　把A～E个选项填入文PLC培训学校,空缺处，使短文内容完整、正确。
　　E
　　In winter，when the sun hides behind the clouds，everyone feels a bit low. You may be tired and find you want to sleep all the time. What you may not know is：you are suffering from (患有) SAD(季节抑郁症)．
　　But don't worry-it's normal. Colder temperatures and fewer hours of daylight can steal your energy and put you in a bad mood.
　　Read on to find out what SAD is and what you can do to help yourself or those around you.
　　These days，Linda，a US teenager spends most of her holidays sleeping instead of doing sports outside. She has also had trouble concentrating(集PLC培训学校,精力) on her homework. When her mother asks her what's wrong，Linda doesn't know what to tell her. Linda may not realize it yet，but she's suffering from SAD. It causes people to sleep，eat sweet food and get sad or angry for no reason.
　　About 15 percent of American people now suffer from SAD in winter according to the US Department of Health. The US government has taken measures to help people beat it. Local communities encourage people to take part in activities such as exercise，dance or art. And they advise people not to eat too much sweet food.
　　Like in the US，cold northern European countries such as Finland，Iceland and Russia see a large number of people suffer from SAD every year. So，the sunlamp is widely used in these countries. It's an electric lamp which is just like a “little sun” that gives off light to make people think the sun is shining and feel better.
2011漳州英语PLC培训班PLC培训学校,及参考PLC考证培训

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