在正常人血清蛋白质醋酸纤维素薄膜电泳图谱中泳动最慢的是（） A.白蛋白 B.α1-球

When I entered Berkeley, I hoped to earn a scholarship. Having been a Straight-A student, I believed I could __1__ tough subjects and really learn something. One such course was World Literature given by Professor Jayne. I was extremely interested in the ideas he 2 in class.

When I took the first exam, I was 3 to find a 77, C-plus, on my test paper,   4  English was my best subject. I went to Professor Jayne, who listened to my arguments but remained_ 5  .

I decided to try harder, although I didn’t know what that  6 because school had always been easy for me. I read the books more carefully, but got another 77. Again, I   7 with Professor Jayne. Again, he listened patiently but wouldn’t change his 8   .

One more test before the final exam. One more  8 to improve my grade. So I redoubled my efforts and, for the first time.   10  The meaning of the word “thorough”. But my  11_    did no good and everything  12  as before.

The last hurdle(障碍) was the final. No matter what   13 I got, it wouldn’t cancel three C-pluses. I might as well kiss the   14  goodbye.

I stopped working head. I felt I knew the course material as well as I ever would. The night before the final, I even  15 myself to a movie. The next day I decided for once I’d have  16__with a test.

A week later, I was surprised to find I got an A. I hurried into professor Jayne’s office. He  17__ to be expecting me. “If I gave you the As you  18 , you wouldn’t continue to work as hard.”

I stared at him.  19 That his analysis and strategy(策略) were correct. I had worked my head   20 , as I had never done before.

I was speechless when my course grade arrived: A-plus. It was the only A-plus given. The next year I received my scholarship. I’ve always remembered Professor Jayne’s lesson: you alone must set your own standard of excellence.

1.        A.  take        B. discuss      C. cover         D. get

2.        A. sought      B. presented    C. exchanged     D. obtained

3.        A. shocked     B. worried      C. scared        D. anxious

4.         A. but         B. so          C. for           D. or

5.         A. unchanged   B. unpleasant   C. unfriendly     D. unmoved

6.         A. reflected     B. meant       C. improved     D. affected

7.         A. quarreled    B. reasoned     C. bargained     D. chatted

8.         A. attitude      B. mind        C. plan         D. view

9.         A. choice       B. step         C. chance       D. measure

10.     A. memorized    B. considered   C. accepted      D. learned

11.     A. ambition      B. confidence   C. effort         D. method

12.     A. stayed        B. went        C. worked       D. changed

13.     A. grade         B. answer      C. lesson        D. comment

14.     A. scholarship     B. course      C. degree       D. subject

15.     A. helped         B. favored     C. treated       D. relaxed

16.     A. fun            B. luck       C. problems     D. tricks.

17.     A. happened       B. proved     C. pretended     D. seemed

18.     A. valued        B. imagined    C. expected     D. welcomed

19.     A. remembering    B. guessing    C. supposing    D. realizing

20.      A. out          B. over       C. on           D. of

人类发明的新材料世界上密度最小的固体“气凝胶”，该物质的坚固耐用程度不亚于钢材，而密度只有3kg/m³。已知某大型飞机采用钢（ρ_钢＝7.8×10³kg/m³)制造，耗钢156吨；若采用“气凝胶”代替钢材来制造一架同样大小的飞机，则需“气凝胶”质量为_______ kg。

传说中布袋戏是谁发明的？

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