阅读理解。A Simple Scientific ExperimentBelow is a descriptio

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阅读理解。

A Simple Scientific Experiment

Below is a description of a single scientific experiment  . It shows us how iron reacts ( 反应) with air and 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 ( 铁钉) ; test tubes ; test tube holder ; cotton wool ; oil ; Bunn burner.Iron in dry airMethod(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.ResultAfter one week, the nails have not rusted.ConclusionIron 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.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.ConclusionIron does not rust in air- free water.Iron in ordinary waterMethod (1)Half -fill a test tube with water and add two or three clean nails.(2)Leave the tube for one week.ResultThe nails rust in the tube with ordinary water.ConclusionIron rusts in ordinary water.           1.  In the first part of the experiment the cotton wool is most probably ud to ______________.        A. dry air                  B. cotton wool           C. ordinary water         D. air-free water2. 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 time③Put some clean iron nails in the tube        ④Add some oil to the water  A. ①②                  B. ①③                 C. ②③                D. ②④3. We can conclude from the experiment that only ____________ makes iron rusty.A. keep the air dry                            B. keep the tube wetC. make the nails rust                          D. keep the tube clean

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1-3 ADC

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科教类阅读

科普类的阅读：科普类的阅读理解包含介绍科学知识、社会知识的短文。阅读这类短文时，要以事实为中心进行思考，抓住事物的特征、用途、相互关系等。如果是介绍社会现象的文章，要掌握所谈现象的内涵。

答题技巧：1. 加强整体意识，把握文章的主要内容。在阅读的时候可给段落标上序号，并给重要的句子和   关键词做上记号，尤其是各段中心句，为答题提供更快捷更多的信息源。 2. 审清题干，发觉和把握试题中有效的提示性信息，确认命题的角度、阅读范围和答题方式。 3. 定位阅读，强化对应意识。同时要注意原文利用和自我加工相结合。