2. 根据背景文章判断对错
FFTFT
3. 用下列词组进行造句
1. It’s our duty to protect our earth.
2. S av i ng t he environment is very urgent.
3. There is a large amount of water being polluted every day.
4. We as well as animals will be sick if we drink dirty water.
5. Water shortage has been a challenge for all the human beings.
4. 完型填空
CBDCD
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