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(jīng)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(qiáng)調(diào)最后的結(jié)果用"to"表示"上漲或下降到…"；強(qiáng)調(diào)變化的差距用"by"，表示"上漲或下降了…"； 根據(jù)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(dá)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(diǎn)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(chǔ)上結(jié)合語境做出符合邏輯、常理的推測．

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