1、托福模拟试卷 31及答案与解析 0 Narrator Listen to part of a lecture in the chemistry class. Now get ready to answer the questions. You may use your notes to help you answer. 1 What is the talk mainly about? （ A） The function of an atom. （ B） The development of atom theory. （ C） The structure of an atom. （ D） Met
2、hods to find an atom. 2 In the lecture, the professor describes the modern atom theory. Clink on the correct box for each statement.3 Why does the professor mention paper clips? （ A） To make an analogy to atoms. （ B） To do a chemical experiment. （ C） To show the usage of paper clips. （ D） To provide
3、 some useful stationery. 4 According to the speech, who found the way to weigh atoms? （ A） Democritus. （ B） CarlH. Snyder. （ C） Amadeo Avogadro. （ D） John Dalton. 5 What does the professor mean when he says this? （ A） He wants the students to divide everything. （ B） He does not like many paper clips
4、. （ C） He wants to generalize the features of an atom. （ D） He thinks the students cant understand him. 6 What does the professor mean by saying this ? （ A） The combination ratio of atoms was resolved. （ B） The weighing method of atoms was resolved. （ C） The construction of water was resolved. （ D）
5、The structure of an atom was resolve 6 Narrator Listen to the conversation between a student and the club secretary. Now get ready to answer the questions. You may use your notes to help you answer. 7 Why does the student call the language club? （ A） To quit the language club. （ B） To apply for a jo
6、b there. （ C） To ask for information. （ D） To chat with somebody. 8 What is the students attitude toward the language club? （ A） He wants to join the club. （ B） He thinks the charge is high. （ C） He thinks the activities are dull. （ D） He likes the debate group best. 9 According to the secretary, wh
7、at two requirements should the applicant meet to join the language club? （ A） He must be a student of the university. （ B） He must pay the fee on time. （ C） He must be an overseas student. （ D） He must be keen on languag 10 What does that mean? （ A） He isnt sure of the membership fee. （ B） He cant d
8、ecide which group to join. （ C） He cant remember the phone number. （ D） He doesnt like to visit the advisor. 11 How can the student find the advisor? （ A） By calling 8843 at 3a. m. on Monday. （ B） By visiting room No. 121 on Tuesday. （ C） By calling 8843 at 8a. m. on Wednesday. （ D） By calling 8834
9、at 8a. m. on Wednesday. 11 Narrator Listen to a talk on home automation in a mechanical engineering class. Now get ready to answer the questions. You may use your notes to help you answer. 12 What is the talk mainly about? （ A） The differences between traditional and automated houses. （ B） The advan
10、tages of automated houses. （ C） The tendency of home automation. （ D） The history of automation technology. 13 What are the benefit of home automation? （ A） Comfortable and cheap. （ B） Environmentally friendly. （ C） Stable and comfortable. （ D） Secure and convenient. 14 According to the professor, w
11、hat is the main reason for the popularity of home automation system? （ A） People are fond of new and modern things. （ B） People dream of creating a space-age home. （ C） People dream of an easy life. （ D） People have not enough time for household chores. 15 How does home automation benefit disabled p
12、eople? （ A） It helps them to perform impossible tasks at home. （ B） It allows them to use voice commands. （ C） It keeps them safe from fire. （ D） It makes their life more enjoyabl 16 What does the home automation system consist of? （ A） Computers, wiring and sensors. （ B） Complicated computer networ
13、ks. （ C） Video-cameras, TV sets and alarms. （ D） Microprocessors, transmitters and electric cables. 17 Why does the professor say this? （ A） Because it controls an alarm automatically. （ B） Because it turns on lights. （ C） Because it keeps the home safe. （ D） Because it frightens strangers. 17 Narra
14、tor Listen to part of a lecture about GPS. Now get ready to answer the questions. You may use your notes to help you answer. 18 What aspect of GPS does the talk mainly discuss? （ A） What it is made up of and its shortcomings （ B） How it works and its attributes. （ C） The history of its development.
15、（ D） How it is different from other technologies. 19 What can be inferred about the present GPS functions? （ A） It is not used for military purposes. （ B） It is important to civilian life. （ C） It handles all kinds of situations. （ D） It offers accurate calculations. 20 According to the speaker, how
16、 accurate is a Garmin GPS receiver? （ A） About 17 feet across. （ B） An average of three to five meters. （ C） Within 15 meters on average. （ D） More than 13 meters. 21 What does the professor imply when he says this? （ A） At least 4 satellites can make 3D position. （ B） To make 3D position three sate
17、llites are enough. （ C） At least 4 satellites can make 2D position. （ D） The GPS receiver is very difficult to lock. 22 What does the professor mean when he says this? （ A） GPS is very useful in military and civilian fields. （ B） GPS is very good at data calculation. （ C） GPS is a modern way to tran
18、sit signals. （ D） It is very difficult for GPS to determine position. 23 What can be inferred about the use of GPS nowadays? （ A） GPS can be used nearly 24 hours a day. （ B） GPS can be used in certain places in the world. （ C） GPS can be used in any weather conditions （ D） GPS can be used with subsc
19、ription or setup fees. 23 Narrator Listen to part of a talk in an environmental science class. Now get ready to answer the questions. You may use your notes to help you answer. 24 What is the talk mainly about? （ A） The definition of air pollutant. （ B） The causes of air pollution. （ C） The dangers
20、of air pollutants. （ D） Ways to fight air pollution. 25 According to the speaker, what is the feature of air pollutants? （ A） Its contents often remain stable. （ B） Its definition will change over time. （ C） Air pollutants are natural. （ D） Air pollutants are man-mad 26 According to the speaker, wha
21、t might be an air pollutant in the future? （ A） Sulfur oxides. （ B） Carbon monoxide. （ C） Nitrogen oxides. （ D） Water vapor. 27 What may be influenced by air pollutants? （ A） Humans and animals. （ B） The global climate. （ C） Vegetations and plants. （ D） Mineral materials. 28 What does the professor
22、mean when he says this? （ A） Little is known about defining a substance as an air pollutant. （ B） The substance isnt an air pollutant when there is a very little in the air. （ C） The substance cant be judged to be an air pollutant only from its actual concentration level. （ D） The actual concentrati
23、on level means little to peopl 29 What can be inferred from this? （ A） Sometimes natural air pollutants can purify air. （ B） Natural air pollutants are harmful to people. （ C） There are some chemical reactions in the air. （ D） Air pollutants move from air to water or soil. 29 Narrator Listen to part
24、 of a conversation between a student and a professor. Now get ready to answer the questions. You may use your notes to help you answer. 30 Why did the student miss the lesson? （ A） He was badly ill. （ B） He forgot the lesson. （ C） His mother was ill. （ D） His mother was busy. 31 Why did the student
25、visit the professor? （ A） To ask for a day off. （ B） To ask some questions. （ C） To return some books. （ D） To hand in homework. 32 According to the professor, what is the advantage of hard copies over electronic documents? （ A） Time saving. （ B） Easier operation. （ C） More flexibility. （ D） Cheaper
26、 cost. 33 What will the student probably do next? （ A） Prepare presentation. （ B） Have another lesson. （ C） Visit his mother. （ D） Visit another professor. 34 Whom does the student refer to when he says “he“? （ A） The author of the text. （ B） The students friend. （ C） The Internet articles author. （
27、 D） Professor Kin 一、 Sections Three： Reading Comprehension 34 Air Pollution and Acid Rain The increasing variety and prevalence of pollution presents the world with many extremely daunting problems, air pollution in particular ranks among the most serious. In the following text, air pollution and ac
28、id rain caused by automobiles will be discussed. Certain solutions to the problem will be provided in the conclusion. It is widely known that cars are the main cause of air pollution in cities, accounting for 60% to 90% of all air pollution. This will get worse as the number of cars increases in urb
29、an areas. How do cars cause air pollution? First we must examine how a car works. Theres a mixture of petrol in the cars internal combustion engine which create the force for the automobile to move. Unfortunately, in this process there are some poisonous chemicals which remain; these poisonous chemi
30、cals mainly come out of the car through the exhaust, its not just what comes out of the car exhaust that is dangerous, the brake system also causes pollution. Brakes on cars release asbestos, it is a highly dangerous substance and it can kill humans. Also, the tires themselves give off small rubber
31、particles which are not very healthy. Acid rain caused by air pollution has strongly influenced peoples lives. It is almost impossible to describe the mathematical relationship between what goes up as pollutant emissions and what comes down as acid rain. However, we do know the primary source of aci
32、d rain is the pollution released by power plants. The pollutants combine with moisture in the atmosphere and then fall as an acid rain. Germans often call it royal water, because it can break down gold. The royal water falls in the form of rain or snow on the German Black Forest and attacks the soil
33、. Microorganisms within the soil perish and metals harmful to trees like aluminum leak into the ground. At the same time, the acid rain attacks the trees leaves and dissolves their waxy coating. The leaves then shrivel and die. About one in every ten trees in the Black Forest is a fir. 76% of all fi
34、rs in the Black Forest are dying. 41% of all spruce are diseased, 43% of all pine are diseased, 26% of beech trees and 16% of all other trees are dying. Environmental groups like Green Peace campaign around Europe trying to stop the causes of acid rain. We need to find solutions to this problem. Fir
35、st, we should try and discourage the overuse of cars. We could do this by raising taxes on petrol or by making cars more expensive. Second, we can encourage alternative methods of transportation. For example, in Shanghai recently, a subway has been built underground, which takes some of the pressure
36、 off the roads. Some people would rather use the underground than drive their cars. Next, we could develop and use cleaner fuels instead of petrol. For example, we might use natural gas in the future or we might experiment with battery powered cars. Finally, the actual by-products of vehicle emissio
37、ns must be managed. (A)Scientists and engineers are now trying to use mechanical means for reducing the amount of chemicals that are emitted from cars exhaust pipes. (B)Germany is now leading the way in attacking this part of the problem. (C)In order to clean up motor vehicle emissions, all new cars
38、 in Germany must now meet new emission standards and be fitted with a device called a catalytic converter. (D)This is a device that is fixed over the exhaust and controls the carbon monoxide and other dangerous chemicals that cars give off. Like Germany, the United States also introduced strict clea
39、n air-controls on motor vehicle emissions in the mid-70s as part of their efforts to reduce acid rain. Its unlikely that any one of these solutions will work on its own. It will take a combination of all four of these solutions to help solve the air pollution problem. 35 The word daunting in Paragra
40、ph 1 is closest in meaning to _. （ A） solvable （ B） frightening （ C） promising （ D） intrepid 36 The word exhaust in Paragraph 2 is closest in meaning to _. （ A） fatigue （ B） outlet （ C） waste gases （ D） extension 37 In Paragraph 3, the author describes the relationship between pollutant emissions an
41、d acid rain by _. （ A） arguing that acid rain results from photosynthesis rather than from combination （ B） describing the process of combining smoke and moisture in the atmosphere （ C） identifying various types of pollutants in the atmosphere （ D） comparing the scientific concept to a familiar huma
42、n experience 38 According to the passage, why is acid rain called royal water? （ A） Because it can dissolve gold which is the symbol of royalty. （ B） Because it seldom happens and is regarded as precious. （ C） Because “royal“ indicates the level of difficulty in acid rain prevention. （ D） Because th
43、is problem has aroused the attention of royalty. 39 The word dissolves in Paragraph 4 refers to _. （ A） collapse （ B） convoke （ C） melt （ D） terminate 40 All of the following are mentioned in Paragraph 2 as contributing to how cars cause air pollution EXCEPT _. （ A） the brakes on cars give off asbes
44、tos bad for health （ B） car combustion emits poisonous chemicals （ C） catalytic converters also produces poisonous chemicals （ D） tires give off small rubber particles harmful to health 41 The word shrivel in Paragraph 4 is closest in meaning to _. （ A） vaporize （ B） collapse （ C） shrink （ D） evapor
45、ate 42 According to the passage, which of the following is true of acid rain? （ A） Tree leaves die of lack of water from acid rain. （ B） Spruce growth is accelerated by acid rain. （ C） Acid rain kills the microorganisms within the soil. （ D） Beech trees suffer more than other trees in acid rain. 43
46、According to the passage, all of the following are the solutions recommended EXCEPT _. （ A） raising taxes on petrol （ B） encouraging the use of mass transit （ C） using catalytic converters （ D） making cars more expensive 44 In Paragraph 7, the author suggests that the solutions to the problems _. （
47、A） prove to be effective. （ B） need the worlds attention. （ C） should work together. （ D） function effectively individually. 45 Look at the four squaresthat indicate where the following sentence could be added to the passage. Use of the converter requires people to switch to lead-free petrol. Where
48、would the sentence best fit? （ A） Square . （ B） Square . （ C） Square . （ D） Square . 46 Complete the table by matching the phrases below. Select the appropriate phrases from the answer choices and match them to the problems and solutions to which they relate. TWO of the answer choices will NOT be us
49、ed. This question is worth 4 points. Answer ChoicesA. Reduce the price of cars.B. Produce poisonous chemicals in combustion engines.C. Fit the car with a catalytic converter.D. Use cleaner fuels rather than petrol.E. Causes pollution by the brakes.F. Encourage alternative methods of transportation.G. Gives off small rubber particles by the tires.H. Raise taxes on petrol.I. Accelerates the growth of microorganisms within the soil. 46 Coming Soon: the Next Great Flu Epidemic The virus first came to official
