2. 外语
  3. Adopting this method, the team raised the average yield______40%.

Adopting this method, the team raised the average yield______40%.

admin2012-02-18  23
问题 Adopting this method, the team raised the average yield______40%.
选项 A、at
B、by
C、to
D、with
答案B
解析 raise the yield by 40%意为“将产量提高了40％”，这是增加或减少多少的倍数表达法。如果要表达的是纯增加或减少的具体数，也用介词by表示(有时by可以省略)，如：raise the price by 10％；The price of tea has risen by five pence．Party membership has increased by 4，000．Butter rose five cents in prices．如果纯增加或减少的量刚好是整数倍时就不需用介词by，如：Foreign investments increased six times．如果要表示“增加到(或减少到)……”时需用介词to；如要表示“(从……)增加到(或减少到)……”时，要用(from…)to，如：The price of tea has risen(from 20 pence)to 30 pence．
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