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                To understand why the Earth is warming up, first of all, we need to understand why it is warm. Our planet is covered with atmosphere (´óÆø).Sunlight passes through the atmosphere and reaches the Earth. The Sun heats up the Earth's surface. When the heat rises into the air, it is stopped by some special gases (ÆøÌå)in the atmosphere like GOz, the heat returns to the Earth and keeps it warm.
                Power stations and cars release (ÊÍ·Å)so many greenhouse gases every day. So we can help stop global (È«ÇòµÄ)warming by using less electric things such as turning off lights when we leave a room, asking our parents to turn down the heating in our house to save energy. We can also stop global warming by finding other ways of transportation. For ple, ride a bicycle or walk instead of going by car, Another way to help stop global warming is to plant and care for trees. Because trees take in C02, they are our best friends when fighting against global warming.
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                37. The underlined word "it" means            in the first paragraph.
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                38.            ways are mentioned to stop global warming according to the second paragraph.
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                B. When can we stop the Earth from warming up
                C. How can we stop the Earth getting warmer
                D. How long will it take to stop the Earth getting warmer
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