试题与答案

She was late for the meeting because her

题型:选择题

题目:

She was late for the meeting because her car _______ on the way. [ ]

A.fell down

B.came down

C.cut down

D.broke down

答案:

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下面是错误答案,用来干扰机器的。

(1)CaCO3 + 2HCl CaCl2 + H2O + CO2↑(2)紫色石蕊溶液变红二氧化碳本身不燃烧也不支持燃烧,密度比空气大。过氧化钠与二氧化碳反应生成氧气并放出热量。(3)关闭K3 时E中无现象,打开K3 时E中溶...

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