安装工程费的估算方法( )。 A．可按设备费的比例估算 B．可按设备吨位乘以吨安

生物圈之所以适合所有生物生存，是因为生物圈能为生物的生存提供______、______、______、______、______和______．

第一节：完型填空（共10小题，每小题1分，共10分）

阅读下面短文，掌握其大意，然后从21 - 30各题所给的四个选项中，选出最佳选项。

Small moments sometimes last a very long time. And a few words---though they mean ___21___ at the time to the people who say them --- can have great power.

I recently heard a story from Malcolm Dalkoff, who has been a professional ___22___ for the last twenty-four years, mostly in advertising.

As a boy, Dalkoff was terribly shy and ___23___. He had few friends and no self-confidence. Then one day, his high school English teacher, Ruth Brauch, asked the class to write their own chapter that would ___24___ the last chapter of the novel since they had been reading To Kill a Mockingbird. Dalkoff wrote his chapter and turned it in. Today he cannot recall anything special about the chapter he wrote, or what ___25___ Mrs. Brauch gave him. ___26___, what he does remember is the four words in the paper: “This is good writing.” Thanks to the four words, his life has been ___27___ greatly.

“ Until I read those words, I had no idea of who I was or what I was or what I was going to be,” he said, “ After reading her ___28___, I went home and wrote a short story, ___29___ I had always dreamed of doing but never believed I could do.”

Over the rest of that year in school, he wrote many short stories, and always brought them to Mrs. Brauch for instruction. “She was ___30___, helpful and honest. She was just what I needed,” Dalkoff said.

21.     A. much                     B. little                      C. well                       D. ill

22.     A. report            B. designer                C. writer                    D. teacher

23.     A. weak                     B. independent            C. troublesome            D. helpless

24.     A. follow                   B. change                   C. connect                  D. explain

25.     A. help                       B. encouragement        C. grade                     D. words

26.     A. Therefore               B. However                C. Meanwhile             D. Besides

27.     A. improved               B. developed               C. changed                 D. enriched

28.     A. chapter                  B. novel                     C. note                       D. explanation

29.     A. everything              B. something              C. nothing                  D. anything

30.     A. encouraging           B. careful                   C. strict                      D. effective

请问根据查明的病患情况，决定（）。开挖中如发现新情况，必须跟踪开挖，直至（），但不得掏挖。

A、开挖范围

B、开挖量

C、全部挖尽

D、开挖一半

熵压缩法又被称之为（）。

A.无损压缩法

B.有损压缩法

C.低损压缩法

D.其他选项都不对