题目内容
阅读下面短文，掌握其大意，然后从各题所给的四个选项中，选出一个最佳答案。
Although we can't see it, there is air all around 1 .If you wave(挥动)your hand in front of your face, you can feel the air moving as your hand pushed through it. 2 on to the back of your hand and you can feel the air coming out of your mouth. We can't live 3 air for we breathe it again and again through our noses and mouths. Air is 4 and it gives life to every 5 thing. When it is still, we don't notice it, but when it moves, we call 6 wind.
When we see a bottle is empty and has 7 in it, that is not really 8 , for the bottle is 9 of air. If the bottle is pushed under water, we can see the air coming out of it as the water goes in.
Although we can't see it and although it is 10 light that we 11 notice it touching us , air has some strength. 12 example, it stops a piece of paper from 13 as quickly as the lid of a tin, If you hold the lid of a tin in our left hand and a small piece of paper in your right hand and 14 them together, the lid will fall quickly, but the paper will fall 15 more slowly. This is 16 the paper has more 17 in pushing its way through the air than the lid has. This shows us that falling things 18 to push their way through the air and that is how parachutes(降落伞)push their way through the air, and that is how parachutes were 19 to same the lives of pilots in 20 accident.
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解析：
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B;D;B;A;D;B;A;D;C;D;D;A;B;A;B;C;D;A;D;B |
轻松课堂单元期中期末专题冲刺100分系列答案