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12．The unemployment rate has decreased _____ 2% to 5.4%，compared with 7.4% last year．（　�。�
A．byB．fromC．withD．on

分析 與去年的7.4%相比，今年的失業(yè)比例已經下降了2%至5.4%．

解答 答案是A．本題主要考查介詞辨析．英語中表示"上漲或下降"的詞都常常與to/by連用：強調最后的結果用"to"表示"上漲或下降到…"；強調變化的差距用"by"，表示"上漲或下降了…"； 根據句意和介詞搭配判斷，去年是7.4%，所以今年"下降了2%至5.4%"，用"decrease by"，所以答案選擇A．本題容易誤選B；看成是from…to的搭配，如果用from，表達的意思是"從2%下降到5%"，很顯然比例在增長，而非下降，邏輯錯誤；

點評 介詞辨析要在掌握各介詞的基本用法和固定搭配的基礎上結合語境做出符合邏輯、常理的推測．

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