问题 选择题

如图是某实验小组为探究可燃物燃烧的条件进行的实验,他们得出的结论不正确的是(  )

A.铜片上的红磷不燃烧是因为温度没有达到着火点

B.水中白磷不燃烧是因为没有与空气接触

C.水中白磷不燃烧说明少量白磷可保存在水中

D.铜片上白磷燃烧说明只要温度达到着火点可燃物就能燃烧

答案

根据燃烧的条件可知,铜片上的白磷能够燃烧是因为达到着火点,并与氧气接触;红磷不能够燃烧是因为没有达到着火点;水中的白磷不能燃烧是因为不与氧气接触.

故选D

完形填空

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

填空题