题目内容
阅读下列短文,从所给的四个选项中,选出最佳答案
You have learned that we can't live without air. We need air in order to live. Do you know that fires too need air in order to burn? If there is no air, you would not be able to make a fire. The more air there is, the longer something will burn.
Let's make an experiment to show this. Take three candles of the same size and two jars, one bigger than the other. Stand the three candles separately and light them. Allow the first one to burn in the open, cover the second one with the smaller jar and the last one with the large jar. Which candle flame(火焰) dies out first? Which candle continues to burn? What will happen to them after some time?
(1) According to the passage, all of us know that ______.
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A.the less wind there is, the less flame a candle has
B.the more wind there is, the less flame a candle has
C.air is necessary for our lives
D.we live in order to take in air
(2) The experiment will show ______.
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A.we cannot live without air
B.we can make a fire unless there is much air
C.the candle in the biggest jar will burn the longest
D.the less air there is, the shorter time a candle will burn
(3) When you light the three candles and cover two of them, you will see the candle in the smaller jar _____.
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A.will die out soon B.goes on burning for long
C.doesn't die out D.continutes to burn
(4) What will the flames of the three candles look like shortly after the experiment begins? Choose one picture which tells the correct experiment.
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(5) If you observe the experiment for some time, you will finally find that ______.
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A.only the second candle flame dies out
B.no candles stop burning
C.only the first candle flame doesn't die out
D.the flames of the three candles continue to be seen