中考冲刺四：阅读理解技巧(基础讲解) --初中英语【名校学案+详细解答】.pdfVIP

中考冲刺四：阅读理解技巧 【真题再现】 阅读理解 【江苏连云港市】 A Simple Scientific Experiment A Simple Scientific Experiment This is a description of a single scientific experiment. It shows us how iron reacts ( 反应) with air an with water. Aim: To find out if iron rusts(生锈) (a) in dry air; (b) in water that has no air in it (air- free water); (c) in ordinary water. Materials: 3 clean iron nails(铁 ); test tubes; test tube holder; cotton wool; oil; Bunsen burner. Iron in dry air (4) A some oil to the water. (This will keep air Method out of the water.) (1) Put some iron nails at the bottom of a test tube. (5) Leave the tube for one week. (2) Push some cotton wool down the tube. Result (3) Leave the tube for one week. The nails do not rust in the tube with air-free Result water. The nails do not rust. Conclusion Conclusion Iron does not rust in air- free water. Iron does not rust in dry air. Iron in ordinary water Iron in air-free water Method Method (1) Half –fill a test tube with water and a two or (1) Half-fill a test tube with water. three clean nails. (2) Boil the water for three minutes. (This makes (2) Leave the tube for one week. sure there is no air in the water. Result (3) Put two or three clean nails in the water. The nails rust in the tube with ordinary water. Conclusion