8. All the characteristics that distinguish birds ________ other animals can be traced to prehistoric times.

A. to 　　　　 　　　　　　　　　　 B. between 　　 　　　 C. for　　　　 　　　　　　 D. from

7. - I’ve studied gardening as a hobby. Could I make some suggestions?

- ____.

A. Go ahead　　　　 　　　 B. You will make it　　 C. Don’t mention it　 　 D. Take it easy

6. He did it _________ it took me. 　 A. one-third a time　　　　 　　　　　　　　　　　　　 　　　　　　　 B. one-third the time 　 C. the one-third time　　　　 　　　　　　　　　　　 　　　　　　　 D. one-third time

5. ______ scientists know where a storm will happen, winds will suddenly change, carrying the storm to a new direction. A. Even if 　　 　 　　　　 B. Since　　　 　　　　　　 C. Despite　　　 　 　D. Unless

4. It never ________ me that he might be in trouble.

A. happened to　 　　　　　　 B. adjusted to　 　　　　 C. belonged to　　　 D. occurred to

3. The actress looked so charming in her beautiful dress that we took ______ pictures with her.

A. a great many of　 　 B. masses of 　　 　　　 C. the number of　　　 　 D. a large amount of

2. ---What attracts people to California is its pleasant climate and relaxed lifestyle.

　 ---This is ______ each year a great number of people from all over the world try to ______

to California.

A. how; immigrate 　　 B. why; immigrate　 C. because; remove　 D. why; remove

第一节：单项填空(共20小题；每小题0.5分，满分10分)

1. We express our thoughts ______ words and body language.

A. in terms of 　　　　　　　 B. in spite of 　　　 　C. in case　　　　 D. by means of

22．(1)，所以，所以F(x)是(0，+∞)上的增函数。

　　　 (2)F(x)=，

∵又F(x)是(0，+∞)上的增函数，∴，∴。

21． (1)图象关于原点对称，∴d=0,b=0 　　　 又过(3, 6),　 ∴9a+c=2

f^/(x)=3ax²+2bx+c=0两根为x₁,x₂，且|x₁x₂|=4

∴

又|x₁x₂|²=，c=12a

∴　　　　 ∴f(x)=

(2)f^/(x)=2x²8　　　　 f^/(3)=10

∴切线方程10xy36=0