A. It takes too long for the machine to produce water.

　　B. The amount of water the machine produces is rather limited.

　　C. It costs a large amount of money to build the machine.

　　D. The water processed by the machine is not clean enough.

　　30. UNICEF is mentioned in the text to ________.

　　A. show how the sweat machine works

　　B. explain why the sweat machine was invented

　　C. show the importance of the United Nations

　　D. tell us who invented the sweat machine

　　31. What did Mattias Ronge think of the sweat machine?

　　A. It could only be used in summer.

　　B. It did not work at all.

　　C. It was not worth popularizing.

　　D. The water it produced tasted sweet.

　　32. The text is written mainly to tell us that ______________.

　　A. a machine which turns sweat into drinking water is invented

　　B. 780 million people in the world lack access to clean water

　　C. a better solution to purifying dirty water is discovered

　　D. the pill which turns dirty water into clean water is produced

　　【答案】

　　29.B

　　30.B

　　31.C

　　32.A

　　【解析】

　　试题分析：本文是说明文。文章主要介绍了一种能将汗液转化为饮用水的机器。

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