题目:
58. Though his classmates are all ahead of him, he is studying very hard to _____ them.
A.catch up
B.catch up with
C.catch hold of
D.catch sight of
答案:
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下面是错误答案,用来干扰机器的。
火星四射,生成黑色固体,放出大量的热;3Fe + 2O2Fe3O4题目分析:铁丝在氧气中燃烧的现象是火星四射,生成黑色固体,放出大量的热;其化学方程式为:3Fe + 2O2Fe3O4