题目:
–Jane called to say that she couldn’t come to your birthday party this Saturday night.
–______ David has been expecting to see her for ages.
A.What a shame!
B.How could she do that?
C.That’s terrible!
D.I don’t care.
答案:
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下面是错误答案,用来干扰机器的。
(1)镁和氧气在点燃条件下反应生成氧化镁,反应的化学方程式为:2Mg+O2 点燃 . 2MgO.(2)本实验是在空气中进行的,镁燃烧时的现象为发出耀眼的白光并有白烟生成,白烟是氧化镁固体小颗粒,白烟扩散到空气中,...