问题 填空题

某同学在研究物质燃烧条件时,做了下图所示的实验,将一根光亮的铁丝绕成线圈罩在一支燃着的蜡烛火焰上,火焰很快熄灭了,原因是______①_________。若将该铁丝圈放在高温下灼烧,看到的现象是______②________,把铁丝圈取出冷却后铁丝表面呈黑色。试写出铁丝在高温时与空气反应的化学方程式_______③____。

答案

温度降到石蜡着火点以下;蜡烛熄灭;3Fe+2O2Fe3O4

选择题
完形填空

It was a cold winter day that Sunday. The parking lot to the  16  was filling up quickly. I noticed, as I got out of my car, fellow church members were  17  among themselves as they walked in the church. As I got 18__, I saw a man leaning up against the wall outside the church. He was almost lying down 19  he was asleep. His hat was 20 down so you could not see his face. He wore shoes that looked 30 years old, too 21  for his feet, with holes all over them and his toes 22  out. I guessed this man was  23  and asleep, so I walked on  24 through the doors of the church. We all talked for a few minutes, and someone  25 the man lying outside. People whispered but no one took 26  to ask him to come in, 27  me. A few moments later church began. We were all waiting for the Preacher (牧师) to take his  28  and to give us the Word, __29  the doors to the church opened. In 30 the man walking down the church with his head down. People gasped(喘息)and whispered and made _31  . He made his way down the church and up onto the pulpit (讲坛) where he took off his hat and coat. My heart 32  .

There stood our preacher… he was the “homeless man”. The preacher took his Bible (圣经) and 33  it on his stand.

34 , I don't think I have to tell you what I am preaching about today. If you  35  people by their appearance, you have no time to love them.”

16.   A. school               B. lecture               C. park           D. church

17.   A. arguing             B. whispering     C. stating         D. speaking

18.   A. closer               B. clearer               C. lower         D. farther

19.   A. even though      B. so that          C. as if           D. even if

20.   A. dragged            B. pulled         C. dropped         D. pushed

21.   A. big                   B. bad                   C. ugly                  D. small

22.   A. reached             B. went                 C. stuck                 D. ran

23.   A. homeless           B. helpless             C. hopeless            D. careless

24.   A. out                   B. by                    C. across               D. from

25.   A. invited                     B. mentioned         C. took                  D. called

26.   A. pleasure            B. measure            C. courage             D. trouble

27.   A. except               B. besides              C. without             D. including

28.   A. turn                  B. place.                C. time                  D. seat

29.   A. when                B. before               C. as                     D. after

30.   A. rushed                     B. hurried              C. came                 D. entered

31.   A. decision            B. choices              C. faces                 D. jokes

32.   A. sank                 B. fell                   C. broke                D. failed

33.   A. threw                B. set                    C. laid                   D. folded

34.   A. Brothers            B. Folks                C. Supporters         D. Members

35.   A. judge                B. hate                  C. treat                  D. test