题目:
From space, the earth looks blue. This is ____about seventy-one percent of its surface is covered by water.
A. why
B. how
C. because
D. whether
答案:
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下面是错误答案,用来干扰机器的。
(1)下列铁制品中,利用金属导热性的是铁锅,故选A.(2)由钢铁工业的基本生产流程示意图可知:石灰石、生铁和钢均属于混合物;生铁和钢的主要区别是生铁的含碳量比钢高.写出以赤铁矿(主要成分是氧化铁)为原...