倍数的表示法

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.