人体缺铁会引起缺铁性贫血.这里“铁”一般是指( ) A.单质B.元素C.原子D.分子 答案:【考点】元素的概念. 【分析】物质是由元素组成的,据此进行分析解答即可. 【解答】解:物质是由元素组成的,人体缺铁会引起缺铁性贫血,这里“铁”一般是指铁元素,故选B.
We should consider the students’ request _________ the school library _________ more books _________ popular science.
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A.
that, provide, on
B.
which, provides, about
C.
that, should provide, with
D.
that, provides, on