题目:
Although they just met for the first time, they talked _____ they had been friends for many years.
A.as long as
B.even if
C.such as
D.as if
答案:
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答案:D题目分析:复分解反应的实质是溶液中的离子相互结合成气体、沉淀、水。离子能够共存,说明这些物质之间不能发生复分解反应,pH=2的溶液中有大量的H+,碳酸根离子结合氢离子会生成二氧化碳和水、氢氧根离子...