文章大意：本文主要讲述了净化水的过程以及在净化的过程中人们采用的多种不同的净化方法。

　　25．From Paragraph 1, we can learn that ________.

　　A．Rain has contained gases when it forms in the clouds

　　B．Dust and microbes are dissolved in rain when rain falls on the ground

　　C．The closer rain is to the ground, the more impure things it contains

　　D．Sand and mud are things rain collects when it falls through the air

　　答案：C　推理题。根据文章第一段as it falls through the air it dissolves some of the gases in the air, It also collects bits of dust and microbes(微生物) that are floating in the air. When the rain reaches the ground it begins to pick up more dust and dirt. Many kinds of mineral substances dissolve in the water. Sand and mud cannot dissolve in water. 可知在下落的过程中，雨水溶解了很多有害的物质在里面，所以雨水越靠近地面，越脏。故C正确。

　　26．According to Paragraph 2, the following statements are wrong except that ________.

　　A．All the microbes in water are harmful so water must be purified

　　B．some diseases can spread through drinking water if it is not clean

　　C．Water is safe to drink if only harmful microbes are removed from it

　　D．it is the government's responsibility to make drinking water clean

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