Sludge may form in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of （）.

A . principle B . principal C . cause D . case

A . A.2 B . B.4 C . C.5 D . D.6

A . Clogged oil pump suction screens B . Increased oil operating temperatures C . Sticking piston rings D . All of the above

A . anaerobic bacteria B . aerobic bacteria C . air bubbles D . disinfection chemical

A . bubbling refrigerant B . overheating and oxidation C . lowered operating temperatures D . reducing the cloud or flash point

A . welding brackets across both ends of the crack B . chipping out and slot welding the entire crack C . drilling a hole at each end of the crack D . cutting a square notch at each end of the crack

A . Flash point improvers B . Pour point improvers C . Inhibitors D . Foam suppressor

A . 正确 B . 错误

A . Ⅰonly B . Ⅱ only C . bothⅠand Ⅱ D . neitherⅠor Ⅱ

A . evaporation B . condensation C . liquefies D . vaporizatio

A . boiler B . main engine C . auxiliary engine D . incinerator

A、the oil feeding is stopped and replaced by admitting flushing water. B、the flushing water feeding is stopped and replaced by admitting oil. C、the feeding of dirty oil and flushing water is stopped. D、the feeding of dirty oil and flushing water is admitted

These who have a passion【C1】______climbing high and difficult mountains are often【C2】______with astonishment. Why are men and women【C3】______to suffer cold and hardship, and to【C4】______on high mountains？ This astonishment is caused, probably, by the difference between mountaineering and other forms of activity【C5】______which men give their leisure. Mountaineering is a sport and not a game. There are no man-made rules, as there are for【C6】______games as golf and football. There are, of course, rules of different kinds which it would be dangerous to【C7】______, but it is this freedom from man-made rules【C8】______makes mountaineering attractive to many people. Those who climb mountains are free to use their own【C9】______. If we【C10】______mountaineering with other more familiar sports, we might think that one big difference is【C11】______mountaineering is not a" team work". We should be mistaken in this. There are it is true , no" matches"【C12】______"teams" of climbers, but when climbers are on a rock face linked by a rope on which their lives may【C13】______, there is obviously teamwork. A mountain climber knows that he may have to fight forces that are stronger and more powerful than man. He has to fight【C14】______of nature. His sport requires high mental and【C15】______qualities. A mountain climber【C16】______to improve in skill year after year. A skier is probably past his best by the age of thirty, and most international tennis champions【C17】______in their early twenties. But it is not【C18】______for men of fifty or sixty to climb the highest mountains in the Alps. They may take more【C19】______than younger men, but they probably climb with more skill and less【C20】______of effort, and they certainly experience equal enjoyment. 【C1】 A．for B．in C．to D．of

是 否

A.boiler B.main engine C.auxiliary engine D.incinerator

A．A.3 years B．B.2 years C．C.1 year D．D.half a year

Your house is not worth as much today as it was a few years ago because of the increased crime rate in your neighborhood. Perhaps your business is not doing as well as it used to because tourism is down due to increased terrorism in your part of the world. Crime, especially violent crime, has risen to a point where many people are afraid to walk al one in their own neighborhoods, afraid to open their door after dark, afraid to speak out and voice their own opinions. Some citizens have reacted by arming themselves with various weapons, legal and illegal, to defend themselves. Citizen groups have taken the law into their own hands by forming their own vigilante groups to administer judgment when they feel that their criminal justice system has not performed its duty. Experts argue whether the number of crimes committed is actually on the rise or whether there is simply a rise in the number of crimes reported. This issue is particularly true in cases of marriage violence, the abuse of spouse or children. Throughout much of history, cases of family violence and neglect often went unreported because of the attitude of society, which considered family matters to be private. Other experts argue about who is really to blame for criminal behavior. the individual or society. Researchers in the United States and Canada have identified several factors in society that contribute to the crime rate: massive urbanization, unemployment and poverty, and a large immigrant population. Other countries are more affected by factors such as politics, government corruption, and religion. (1)What does the passage mainly discuss？ A、Crime the widespread problem. B、The results caused by increasing violent crime. C、Factors contributing to the crime rate. D、Citizen groups combating crimes. (2)The word shoplifting in line 4 is closest in meaning to _____________. A、the crime of lifting the ban B、the crime of moving the shops away C、the crime of robbing things from shops D、the crime of stealing things from shops (3)Why does the author in Paragraph 2 mention citizen groups forming their own vigilante groups？ A、To show the criminal justice system is not just B、To show citizens are powerful in combating crimes C、To show crime is a serious social problem D、To show citizens have rights in combating crimes (4)According to the passage, which of the following are the factors contributing to United States’criminal behavior？ A、Politics, unemployment, poverty and a large immigrant population. B、Massive urbanization, unemployment and poverty, and a large immigrant population. C、Politics, government corruption, poverty and religion. D、Massive urbanization, unemployment and poverty, and government corruption. (5)Which of the following statements is TRUE according to the passage？ A、Since you have never been robbed, you are not a victim of crime. B、Some people use illegal weapons to defend themselves. C、Only the individual should be responsible for the criminal behavior. D、Family violence and neglect are considered family matters, and therefore private, so they are not crimes.

1.According to the passage, where can we find job advertisements more often nowadays (). A.In a magazine. B.In a newspaper. C.On a website. 2.How do people apply for a job (). A.By phone. B.By email. C.Go to visit the company. 3. Besides the application letter, what else is also important() A.A resume. B.A picture. C.A certificate. 4.What do companies provide to job applicants nowadays before they apply for jobs() A.A standard form. B.An invitation letter. C.An email address. 5.Who is in charge of selecting the applicants for the coming interview(). A.The manager of the company. B.The Human Resources Department. C.The secretary of the manager.