1) 倍数＋形容词/副词比较级＋than
the girl is ten times cleverer than her brother.
2) 倍数＋as+形容词/副词/(名词)＋as
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
the sun is many times the size of the moon.
4) 动词＋倍数
the pants have shortened two times since they were bought.
5) 动词+by+数词/百分比/倍数
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.