正确答案: A

①②③

题目：在下列变化①大气固氮②硝酸银分解③实验室制取氨气中，按氮元素被氧化、被还原、既不被氧化又不被还原的顺序排列，正确的是

解析：A

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举一反三的答案和解析：

[单选题]

time

[单选题]一般来说，叶的生长期是有限的，叶在短期内生长达到一定大小后，生长即停止。( )

正确

[单选题]BWe once had a poster competition in our fifth grade art class.

It must include the words on the blackboard.

解析：【解析】细节理解题。由第二段末句，老师说的话You just have to make sure that the words on the blackboard appear somewhere on your poster可知。

[单选题]6根据4判断，在非洲土地退化的区域中，面积最大的气候类型的特征是

全年高温，分干湿两季

[单选题]What would be the best ritle for this text?

Effects of Television on Children