B

Particles from car exhausts generate more persistent clouds but less rain, new research suggests. Furthermore, putting more of these particles into the atmosphere reduces the low-level winds, which could reduce the amount of wind power available in very polluted regions. The dry but populated regions may therefore suffer a triple blow as a result of vehicle pollution：less water, less hydropower and less wind energy.

Scientists studied the effects of aerosol（浮质）pollution from cars and industry. They correlated satellite data on wind speeds and the amount of aerosol particles in the atmosphere above the South Coast Basin in California and above China. Results showed that higher concentrations of aerosols were closely associated with slower ground winds. Scientists then used computer models to support the idea that there was a cause and effect relationship behind this correlation.

Particles floating in the atmosphere block energy from the Sun, preventing it from warming the surface of the Earth. Cooler surface temperatures during the day means the low—level and slow moving air does not rise up and mix with the faster winds at higher altitudes. Slower winds also induce less evaporation from oceans, rivers and lakes. And finally, once clouds have formed, they store less moisture in the form of rain. This is because raindrops form around small particles— dust, for instance, or pollution. With more particles in the atmosphere, it takes longer for enough water to condense（凝结）onto a particle to form a raindrop. And if the cloud of fine droplets（小滴）moves to a drier area before its would-be rain can rail, the moisture evaporates once more and the cloud disappears.

Scientists note their new work does not contradict previous findings that suggest global warming might lead to more tropical storms, because there is far less particulate（微粒的）pollution over the oceans.

60. The first paragraph mainly talks about        .

A. the results of vehicle pollution

B. an introduction to particles from car exhausts

C. less wind energy in polluted regions

D. less water caused by vehicle pollution

61. From this passage we can learn that        .

A. scientists supported their idea by using material models

B. the new study is contrary to the previous findings

C. if there are more particles in the atmosphere, there will be more raindrops

D. there is a cause and effect relationship between wind speeds and particle pollution

62. The underlined word “induce” in Paragraph 3 most probably mean       _ .

A. reduce         B. persuade           C. cause             D. produce

63. What’s the best title for the passage?

A. Pollution and Global Warming          B. Car, Wind and Rain

C. Industry Pollution                    D. How Rain Forms

Today, ultrasonic(超声的) waves are being put to work in laboratories and factories. If an ultrasound generator is placed in a liquid, the waves move the liquid back and forth hundreds of thousands of times each second. This causes materials to mix quickly or to dissolve(使分解，使溶解) in liquids. Paint manufacturers(制造商) use ultrasound to do a better job of blending colors. The companies that make film for your camera find that mixing chemicals by the use of sound waves will produce a more sensitive film.

The new lightweight(轻量的) type of washing machine uses ultrasonic waves to get clothes clean. Its special ultrasound generator is put into a pail of soapy water containing the soiled clothes. The sound waves drive the soapy water back and forth through the cloth so fast that everything is soon clean. There is also a new kind of dishwasher that works in much the same way.

Ultrasonic waves can shake a liquid so fast that tiny holes form all through it. The liquid is actually torn apart by this action. Almost as soon as these holes are made, they fall together again. The result is a powerful pounding action. In the dairy industry this is used for the double purpose of making homogenized(使均匀，使匀质) milk and sterilizing(使无菌) it at the same time. If you look at some raw milk with a microscope, you find that it is made up of little drops of butter fat floating around in a watery liquid. In order to make milk easier to digest, these fat droplets(微粒) may be broken up by forcing the milk through very small openings. The result is called homogenized milk. When the ultrasonic method is used, the sound waves not only break up the droplets but also kill the germs in the milk by pounding them to pieces. (from www.nmet168.com)

1. Why does a paint manufacturer use ultrasound to do a better job of blending colors?

A. Because it is cheap to use ultrasound to blend colors.

B. Because the waves move the liquid so quickly that it can make materials mix quickly or dissolve in liquids.

C. Because they can mix chemicals by the use of sound waves.

D. Because the waves can clean the paint.

2. What properties does ultrasound wave have?

A. Homogenizes and sterilizes the milk.   B. Mix materials and break droplets.

C. Kill germs and sterilize milk.          D. Move liquids quickly.

3. What exists in the raw milk?

A. Little drops of butter fat.       B. Small holes.

C. Fat droplets and germs.        D. Chemicals.

4. Where is ultrasound wave not used?

A. In the paint manufacture.                   B. In the shop mixing bread flour.

C. In the film-making company.       D. In the dairy industry.

请完成下面句子，注意使用词的正确形式。请将词写到下面的横线处。
【小题1】Dealing with such a ____________(复杂的) problem calls for patience and skill.
【小题2】This is a technical problem. You ’d better seek __________(专业的) advice .
【小题3】She bought an ever-green plant as a _________________(装饰) in her new house .
【小题4】Would you make me an overcoat out of this heavy __________(羊毛制的) cloth .
【小题5】Some Mexicans were arrested for entering America __________(非法地)
【小题6】He has __________(积累) great wealth by hard work and wise investment .
【小题7】The clothes he designed were always fancy and _________________(令人耳目一新的) 。
【小题8】After a 5-hour talk , the company and the workers finally reached a ___________(一致意见、共识) on the proposed pay rise .
【小题9】We are advised to eat more vegetables rich in ______________(纤维质) and less meat .
【小题10】How could you have ____________(忽视) such important  information .

请完成下面句子，注意使用词的正确形式。请将词写到下面的横线处。

1.Dealing with such a ____________(复杂的) problem calls for patience and skill.

2.This is a technical problem. You ’d better seek __________(专业的) advice .

3.She bought an ever-green plant as a _________________(装饰) in her new house .

4.Would you make me an overcoat out of this heavy __________(羊毛制的) cloth .

5.Some Mexicans were arrested for entering America __________(非法地)

6.He has __________(积累) great wealth by hard work and wise investment .

7.The clothes he designed were always fancy and _________________(令人耳目一新的) 。

8.After a 5-hour talk , the company and the workers finally reached a ___________(一致意见、共识) on the proposed pay rise .

9.We are advised to eat more vegetables rich in ______________(纤维质) and less meat .

10.How could you have ____________(忽视) such important  information .

B
Particles from car exhausts generate more persistent clouds but less rain, new research suggests. Furthermore, putting more of these particles into the atmosphere reduces the low-level winds, which could reduce the amount of wind power available in very polluted regions. The dry but populated regions may therefore suffer a triple blow as a result of vehicle pollution：less water, less hydropower and less wind energy.
Scientists studied the effects of aerosol（浮质）pollution from cars and industry. They correlated satellite data on wind speeds and the amount of aerosol particles in the atmosphere above the South Coast Basin in California and above China. Results showed that higher concentrations of aerosols were closely associated with slower ground winds. Scientists then used computer models to support the idea that there was a cause and effect relationship behind this correlation.
Particles floating in the atmosphere block energy from the Sun, preventing it from warming the surface of the Earth. Cooler surface temperatures during the day means the low—level and slow moving air does not rise up and mix with the faster winds at higher altitudes. Slower winds also induce less evaporation from oceans, rivers and lakes. And finally, once clouds have formed, they store less moisture in the form of rain. This is because raindrops form around small particles— dust, for instance, or pollution. With more particles in the atmosphere, it takes longer for enough water to condense（凝结）onto a particle to form a raindrop. And if the cloud of fine droplets（小滴）moves to a drier area before its would-be rain can rail, the moisture evaporates once more and the cloud disappears.
Scientists note their new work does not contradict previous findings that suggest global warming might lead to more tropical storms, because there is far less particulate（微粒的）pollution over the oceans.
60. The first paragraph mainly talks about        .
A. the results of vehicle pollution
B. an introduction to particles from car exhausts
C. less wind energy in polluted regions
D. less water caused by vehicle pollution
61. From this passage we can learn that        .
A. scientists supported their idea by using material models
B. the new study is contrary to the previous findings
C. if there are more particles in the atmosphere, there will be more raindrops
D. there is a cause and effect relationship between wind speeds and particle pollution
62. The underlined word “induce” in Paragraph 3 most probably mean       _ .
A. reduce         B. persuade           C. cause             D. produce
63. What’s the best title for the passage?
A. Pollution and Global Warming          B. Car, Wind and Rain
C. Industry Pollution                    D. How Rain Forms