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  • 更新 2022-09-03
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The earth is our home; we must take care of it. This means that it is necessary and important ________the land, air and water clean. However, pollution is beginning to threaten(威胁) our__________, happiness and our life ——we see it, smell it taste it and discuss it.
Men began to________the earth a long time ago. When land was ________up or water became dirty, men had to move to ________places. At first, there weren’t so many people then and there were less trash. All the dirty things could be absorbed (吸收)by nature. ______now this is no longer true. The increase of population and the development ________ industry have changed that. Men are still polluting the environment.
later, ________of people have realized the________of pollution. A lot of people are now working hard to protec________ environment. Everyone should try their best to make our environment better and better.

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