根据材料,回答问题。C Air pollution is caused by many things, Great cl

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What is the main idea of the passage?

What is the main idea of the passage?A.What is subhealth? B.How to keep away fr

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If you can't _______,you may talk with the help of gestures.

If you can't _______,you may talk with the help of gestures.A.write and read B.

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