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

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

admin2013-03-25  17
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％“将产量提高了百分之四十”，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，就用介词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 member-ship has increased by 4000；Butter lose five cents in prices．如果纯增加或减少的量刚好是整倍数时就不需用介词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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考研英语一

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