题目内容
.Failure can make a positive contribution to your life_________you learn to use it.
A.since B.unless C.until D.once
D
天天向上一本好卷系列答案
小学生10分钟应用题系列答案I am always eager to do experiments, especially chemistry ones. It's _26_ to work with test tubes and beakers（烧杯） , even though sometimes my efforts end in__27___. Experiments were fun for me __28 a recent accident.
The 29 happened when I was heating a big test tube with an alcohol burner（酒精灯） , chatting to my partner while waiting for__30____ changes. All of a sudden, the tube cracked. Even though I jumped from my seat when I heard the crack, the hair on my forehead was __31____ as I was leaning too close to the test tube.
__32___ I had no time to be sad about my hair: the liquid in the test tube poured onto the table and caught fire. I'd never 33 _ anything so bad! My___34___went blank （空白）for a moment. Then I quickly covered the fire with a damp cloth to__35____.
The teacher told me that the test tube broke in half at the bottom because we didn't dry it properly before __36___ it.
We calmed down and did the experiment, again. But our hearts were still __37____ rapidly even after we walked out of the lab.
But my bad __38___ didn't end there! Since all __39 was focused on the flames while we were in the lab, I didn't see the liquid falling onto my trousers.
During the following class, I felt a __40___ in my leg. Soon it became more and more painful and I touched the area with my fingers, _41_ to make things better. But to my great 42___ , the material of my trousers turned into powder! “Vitrio（硫酸）! ! !”The terrible word came into my mind. I rushed out right away to wash and examine my poor skin. _43_ , it was not a serious injury.
After changing my __44____I sat down and told myself: danger is no joke! It's very important to have a serious___45___ in chemistry class. Doing scientific experiments as a learner is no laughing matter.
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Have you ever seen a movie in which a building was burnt down or a bridge was destroyed? Have you seen films in which a train crashed or a ship __21_ into the ocean? If so, you may have wondered how these things could happen without __22_the people in the film.
The man who knows the __23__ is the “special-effects” man. He has one of the most important jobs in the film __24__. He may be __25__ to create a flood or to make a battlefield explode. But he may also be told to create a __26_ effect which is much less exciting, though just as important to the success of the film. In a __27__ for one movie there was a big glass bowl __28__with water in which small fish __29__ swimming. The director of the movie__30__ the fish to stop swimming suddenly __31_ they seemed to stare at(盯着) an actor. Then the director wanted the fish to stop staring and swim away. But fish suddenly __32__ be ordered to do anything. It was quite a __33_.
The special-effects man __34_ about this problem for a long time. The result was an idea for __35_ the fish with a harmless use of electricity. __36__he applied electricity to the fish bowl causing the fish to be totally still(静止的). Then he rapidly reduced the __37__ of electricity allowing the fish to be free. __38_ he got the humorous effect the director wanted.
__39_in other parts of movie making there are those who have developed __40__ skill in creating certain kinds of effects. Jim White, who has been a special-effects man for thirty-two years, is best known for work with ships and airplanes.
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