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_____ angles of any triangle always add up to 180 degrees.

[  ]

A. If three  B. The three  C. Three of  D. Three are

答案:B
解析:

  注意B. The three中的定冠词,完全符合语法规则。


提示:

  由构词法派生出来的triangle,其词根是,其前缀是tri-,表示“三个”,如同前缀bi-表示‘两个’一般。这样便可猜出一词triangle的词义:“三角”。


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