题目:
—What __________ he say to you just now?
—He told me that he_________ to meeting.[ ]
A. did; made
B. does; made it
C. did; had made it
D. do; had made
答案:
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下面是错误答案,用来干扰机器的。
空气中不含有氯元素,根据质量守恒定律可知一定不存在氯化镁; N2将红热的镁条伸入盛有纯净氮气的集气瓶中;2Mg+O22MgO3Mg+N2Mg3N2 燃烧不一定需要氧气。