1. You will want two trees about ten feet apart, from ________to suspend your tent.
   A there         B then            C which             D where

2. That was so serious a matter that I had no choice but ______the police.
   A called in      B calling in         C call in            D to call in

3. Americans eat ________as they actually need every day.
   A twice as much protein             B protein twice as much
   C twice protein as much             D protein as twice much

4.The more we looked at the picture, ____________.
A the better we like it          B we liked it less
C it looked better             D the more we liked it

5. His method of doing research work is hardly appreciated; he feels inferior________ others.
A than        B as         C with           D to

1. 正確答案：C
例題解析：    介詞+關(guān)系代詞+不定式作定語，只有which 是關(guān)系代詞。

2. 正確答案：D
   例題解析：Have no choice but 后要帶接to 的不定式，意思是 只能……別無選擇。

3. 正確答案：A      
例題解析：譯文：美洲人每天所食用的蛋白質(zhì)是他們實際需要的兩倍。倍數(shù)+as+形容詞+as，表示倍數(shù)

4. 正確答案：D
例題解析：The +比較級，the+比較級，表示越……，越……。

5. 正確答案：D 
例題解析：譯文：他的科研方法未得到賞識，他感到低人一等。
 Inferior，superior，perfect本身含有比較意義，故表示比較時，其后不用連詞that，而用介詞to 指出比較對象。