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.