卷临天下 全国100所名校最新高考模拟示范卷语文2022答案

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7.C碳纤维由碳单质构成，不属于天然高分子材料，A错误；铝合金硬度大，B错误；氢气作燃料燃烧产物是水，对环境友好无污染，C正确；钾元素的焰色反应为紫色（透过蓝色钴玻璃观察），D错误。

As we all know, plastic doeseaterharm. to the envireatronment. It can also enter into our bodies and cause seriousdamages to our health. Last week our class did the surveydamageappyto learn about peoples plastic habitsappi, all thepeople interviewed said they knew the importance of environmental protection that they were taking action. Butto their disappointment, we found there were still manypeople.using plastic bags while shopping. So we managed∧buy some cloth bags with our pocket money and thnengiveavethem away to people