A. | two month | B. | two-months | C. | two month's | D. | two-month |
科目:初中英語 來源: 題型:閱讀理解
Below is a description of a single scientific experiment.It shows us how iron reacts ( 反應(yīng)) with air and with water. Aim:To find out if iron rusts( 生銹) (a) in dry air; (b) in water that has no air in it ( air-free water); (c) in ordinary water. Materials:3clean iron nails ( 鐵釘); test tubes; test tube holder; cotton wool; oil; Bunsen burner. | |
Iron in dry air Method (1)Put some iron nails at the bottom of a test tube. (2)Push some cotton wool down the tube. (3)Leave the tube for one week. Result After one week,the nails have not rusted. Conclusion Iron does not rust in dry air. Iron in air-free water Method (1)Half-fill a test tube with water. (2)Boil the water for three minutes.( This makes sure there is no air in the water. (3)Put two or three clean nails in the water. | (4)Add some oil to the water.( This will keep air out of the water.) (5)Leave the tube for one week. Result The nails do not rust in the tube with air-free water. Conclusion Iron does not rust in air-free water. Iron in ordinary water Method (1)Half-fill a test tube with water and add two or three clean nails. (2)Leave the tube for one week. Result The nails rust in the tube with ordinary water. Conclusion Iron rusts in ordinary water.(238words) |
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A. | like | B. | of | C. | except | D. | from |
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A. | suppose | B. | supposed | C. | supposing | D. | be supposed |
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A. | pack | B. | pass | C. | park | D. | pick |
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