求解答过程:阅读理解. A
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求解答过程:阅读理解. A
阅读理解. | |||
A Simple Scientific Experiment | |||
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1. In the first part of the experiment the cotton wool is most probably used to ______________. A. dry air B. cotton wool C. ordinary water D. air-free water | |||
2. What are necessary steps to make sure the water in the tube is air free? | |||
①Leave half a tube of water in it ②Boil the water for some time ③Put some clean iron nails in the tube ④Add some oil to the water A. ①② B. ①③ C. ②③ D. ②④ | |||
3. We can conclude from the experiment that only ____________ makes iron rusty. | |||
A. keep the air dry B. keep the tube wet C. make the nails rust D. keep the tube clean |
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