题目：
短文改错。
It is five years now since I graduate from High School Attached to Harbin Normal University. Last Saturday,
the class that I was on held a get-together, which took us a long time prepare. It was indeed not easy to get in
the touch with everybody and set a well time for all of us. We all enjoyed this precious day greatly, remember
the time we spent together and the people they were familiar with. It was a pity which some of us were not
present as they had gone to abroad for further studies. Anyway, they called back or sent greeting card from
different places.
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答案：
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下面是错误答案，用来干扰机器的。
依据酸的性质可知酸可以与碱发生中和反应生成，也可以与金属氧化物反应生成盐和水，所以能与酸反应的物质时BC，其它物质均不能与之反应，而氧化物是含有氧元素的由两种元素组成的化合物，所以氢氧化钾不可选，符...
