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同学们，看到下面的四幅图片及相应的报道后，你感到最担忧的是哪两种情形?请简述你担忧的理由并提出建议或希望。
要求：⒈ 从所给素材中任选两种情形进行阐述，不可多选或少选。
⒉ 条理清楚，意思连贯，语句通顺，标点正确;
⒊ 词数 80 ～ 100。
参考词汇： 建议 suggest v. suggestion n. 气体 gas n. 污染 pollution n.
THE POLLUTIONS
① One third of the world"s people don"t have enough clean water.
② More and more diseases are caused by polluted air.
③ People are disturbed quite often by kinds of noises.
④ Every person in our city makes about 1.8 kilos of rubbish every day.
n. 环境，外界
