短文改错。

Our school held an English speech contest each year. Han Meimei won the first prize in last year. Everyone was sure that she was going to the champion again this year. Yet, to our surprise, she, instead getting the first prize, coming out second in the end. When the judge at the contest announced the results, Han Meimei felt so sadly that she almost cried. Therefore, she was not discouraged. When the second prize was given to her, she said to her, “The prize is not of important. I am going to work still hard to improve my English speaking ability.

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找出单词中不同类的词（）

根据短文理解选择答案。

如图，在正三棱柱ABC﹣A′B′C′中，若AA′=2AB，则异面直线AB′与BC′所成角的余弦值为（   ）