2. 外语
  3. The constant friction of the wire on the metal pulley eventually caused it to break.

The constant friction of the wire on the metal pulley eventually caused it to break.

admin2009-06-15  79
问题 The constant friction of the wire on the metal pulley eventually caused it to break.
选项 A、declining
B、ageing
C、pulling
D、rubbing
答案D
解析 declining：倾斜的，衰退的；ageing：衰老或成熟的过程；pulling：拉动；rubbing：摩擦。题中friction意为“摩擦，冲突”，可知D项符合要求。
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