Question

　　Have you ever seen a greenhouse? Most greenhouses look like a small glass house.

　　Greenhouses are used to grow plants，especially in winter.Greenhouses work by trapping heat from the sun，the glass panels(板) of the greenhouse let light in，but keep heat from escaping.This causes the greenhouse to heat up，much like the inside of the parked in sunlight，and keeps the plants warm enough to live in winter.

　　The earth's atmosphere(大气) is all around us.It is the air that we breathe.Greenhouse gases in the atmosphere behave much like the glass panels in a greenhouse.Sunlight enters the Earth's atmosphere，passing through the blanket of greenhouse gases.As it reaches the Earth's surface，land，water，and biosphere(生物圈)，they take up the sunlight's energy.Once the heat is taken up，this energy is sent back into the atmosphere.Some of the energy passes back into space，but much of it remains trapped in the atmosphere by the greenhouse gases，causing our world to heat up.

　　The greenhouse effect is important.Without the greenhouse effect，the Earth would not be warm enough for humans to live.But if the greenhouse effect becomes stronger，it could make the earth warmer than usual.Even a little extra warming may bring problems to humans，plants，and animals.

　　根据短文内容，回答下列问题。

　　1.What are greenhouses used for?

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　　2.Why is the temperature in the greenhouse higher than that outside?

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　　3.What behaves much like the glass panels in a greenhouse?

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　　4.If we didn't have the greenhouse effect，what would happen?

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　　5.What does the article mainly tell us?

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Answer 1

　1.They are used for growing plants.答案来自第二段的第一句。

　　2.根据短文第二段中温室效应的工作原理可知，答案是 Because the glass panels of the greenhouse can let light in，and keep heat from escaping.

　　3.根据短文第三段的“much of it remains trapped in the atmosphere by the greenhouse gases”可知，温室塑料板的作用像空中大气层的作用，即答案是 Greenhouse gases in the atmosphere.

　　4.根据最后一段内容可知，如果没有大气层的温室效应，人类就不能生存，即答案为 Humans couldn't live because the earth would not be warm enough.

　　5.根据全文内容可知，主要是温室效应及对人类的影响，所以答案为 It mainly tells us what the greenhouse effect is and its influence.