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Global warming is when the earth heats up,the temperature rises.It happens when greenhouse gases—carbon dioxide,water vapor,nitrous oxide(二氧化氮),and methane(沼氣) trap heat and light from the sun in the earth’s atmosphere,which increases the temperature.This is like when heat is trapped in a car.On a very hot day,the car gets hotter when it is out in the parking lot.This is because the heat and light from the sun can get into the car,by going through the windows,but it can’t get back out.Once the light is inside the car,it is trapped and the heat builds up,just like it does in the earth’s atmosphere.This is what the greenhouse effect does to the earth.The heat and light can get through the atmosphere,but it can’t get out.As a result,the temperature rises.
Sometimes the temperature can change in a way that helps us.The greenhouse effect makes the earth appropriate for people to live on.Without it,the earth would be freezing,or on the other hand it would be burning hot.We would not get the sun’s heat and light to make the night somewhat warm.During the day,especially during the summer,it would be burning because the sun would be up with no atmosphere to filter(過濾) it,so people,plants,and animals would be exposed to all the light and heat.
Although the greenhouse effect makes the earth able to have people living on it,if there gets to be too many gases,the earth can get unusually warmer,and many plants,animals,and people will die.They would die because there would be less food (plants like corn,wheat,and other vegetables and fruits).This would happen because the plants would not be able to take in the heat.This would cause us to have less food to eat,but it would also limit the food that animals have.Gradually,people,plants,and animals would all die of hunger.
People are doing many things to try to stop global warming.One thing people are doing is carpooling.Carpooling is driving with someone to a place that you are both going to.This minimizes the amount of greenhouse gases put into the air by a car.
Another thing that people are doing is being more careful about leaving things turned on like the television,computer,and the lights.A lot of people are taking time away from the television,and instead,they are spending more time outdoors.This helps our planet out a lot.Now,more people are even riding buses,walking to school,and riding their bikes to lower the amount of greenhouse gases in the air.
Planting trees and recycling also help.If you recycle,less trash goes to the dump,and less trash gets burned.As a result,there are fewer greenhouse gases in our atmosphere.Although adults do many things to help stop global warming,kids can do just as much.
小題1:By the example given in Paragraph 1,the author wants to ________.
A.explain how greenhouse gases work
B.show his feeling in a car in hot summer
C.tell us cars are causes of greenhouse gases
D.say that there are greenhouse gases in every car
小題2:The underlined word “it” in Paragraph 2 refers to “________”.
A.lightB.heat
C.temperatureD.greenhouse effect
小題3:What is the main idea of Paragraph 3?
A.If there is greenhouse effect,all the plants will die.
B.Human beings are likely to disappear from the earth.
C.Crops can’t take the heat if there is greenhouse effect.
D.Although greenhouse effect is necessary,too much of it causes us to die.
小題4:What will the author most probably discuss in the paragraph that follows?
A.Why cars and buses pollute the air a lot.
B.What kids can do to help stop global warming.
C.What global warming is doing to the environment.
D.Who should be responsible for the environmental problems.

小題1:A
小題2:D
小題3:B
小題4:D

小題1: A
解析 寫作目的題。通過這個例子作者形象地解釋了地球溫室效應形成的原理。
2答案 D
小題2: 代詞指代題。根據第二段第二句的內容可知,溫室效應使得地球適宜人類居住,故it指代溫室效應。
小題3: D
解析 段落大意題。溫室效應既有益處,也有害處,太多的氣體會使溫室效應過度,導致動植物死亡,人類也因此滅亡。
小題4:B
解析 邏輯結構題。文章最后三段談論的都是成人為保護環(huán)境可以采取的行動,根據最后一句話“Although adults do many things to help stop global warming,kids can do just as much.”的提示,文章接下來可能會談論兒童為保護環(huán)境能做的事情。
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小題2:
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C.It is difficult to find space to bury waste in modern society.
D.Ways to deal with waste in modern society stay the same.
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C.It did not cause any problems.
D.It was regarded as similar to comets and stars.
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C.It floats slowly around the Earth.
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小題4:What has been done about the space trash problem­?
A, Scientists have cleaned up most of the trash.
B. Large pieces of space trash are being closely watched.
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The yearly Consumer Electronics Show is the biggest technology trade show in North America and one of the biggest in the world.
Gary Shapiro is president and CEO of the Consumer Electronics Association, the group that organizes CES. He gave one of the keynote speeches on opening day.
“Now you know that CES is more than a trade show. It’s a gathering of the brightest minds and the top leaders from many industries and those seeking a glimpse into the future.”
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C.offers a personalized experience D.can track your activity
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A.CES is only a big trade show.
B.CES offers a glimpse into the future.
C.CES lasts only four days in all.
D.He thinks little of the new products’ quality.
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A.HiSenseB.PanasonicC.TCLD.CEA
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A.the CES is held every 4 years
B.at the 2013 CES, the TV section was crowded
C.if you watch TV every day, you needn’t see a doctor
D.tablet computers drew more attention at the 2013 CES

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