题目内容
20．The plane flew at aheight（高度） of 3，000metres．分析 飞机在3000米高空飞行．
解答 答案：height 考查单词填空．根据题干：飞机在3000米高空飞行． a后面要用单数名词，故答案是height
点评 解答此题的关键是根据语境推测要填内容表达的含义，然后能理解各选项内容，有时可能没有必要细细区分每个单词的含义，仅根据句子语气就可以判断出正确答案．
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