It’s necessary for human beings to breath _______ and plants can produce it.A.CO2B.H2C.O2D.N2-七年级英语

题目简介

It’s necessary for human beings to breath _______ and plants can produce it.A.CO2B.H2C.O2D.N2-七年级英语

题目详情

It’s necessary for human beings to breath _______ and plants can produce it.
A.CO2B.H2C.O2D.N2
题型:单选题难度:中档来源:不详

答案

C
根据常识对于人类而言呼吸氧气是必要的,植物能产生氧气,故选C。A是二氧化碳,B是氢气,D是氮气。

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