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[Daily Question] Basic Process Knowledge (Multiple Choice) 20191015

2019-10-14View Original

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Water and air are precious natural resources that are closely related to the survival and development of humans, as well as animals and plants. Regarding the understanding of water and air below, which one do you think is correct? (B) A﹒Pure drinking water contains no chemicals. B﹒Freshwater resources are limited and in short supply. C﹒Fresh air is a pure compound. D﹒The monitoring items included in daily reports on urban air quality currently cover carbon dioxide levels

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