倍数的五种表达法

    1)倍数＋形容词／副词比较级＋than

　　【例如】

　　The girl is ten times cleverer than her brother.

　　2)倍数＋as+形容词／副词/(名词)＋as

　　【例如】

　　His apartment is three times as large as that of mine.

　　Americans eat( )as they actually need every day. (CET-4 1998,6)

　　A) twice as much protein

　　B) twice protein as much twice

　　C) twice protein as much

　　D) protein as twice much本题考查倍数的表达方法，正确形式应为：倍数＋as+形容词／副词/(名词)＋as，故答案为A.

　　3)倍数＋名词

　　【例如】

　　The sun is many times the size of the moon.

　　4)动词＋倍数

　　【例如】

　　The pants have shortened two times since they were bought.

　　5)动词+by+数词/百分比/倍数

　　【例如】

　　The landlord wanted to raise the rent by a third.

　　Between 1974 and 1997, the number of overseas visitors expanded

　　( )27%. (CET-4 2000,1)

　　A) by

　　B) for

　　C) to

　　D) in

　　本题考查动词+百分比的表达方法，正确的连接词为by，故答案为A.