29.B细节理解题。由第五段中的The amount of water it produces depends on ... just about a mouthful可知，这台机器的产水量太少了，故选B项。

　　30.B细节理解题。由第三段的内容可知，作者在文中之所以提到UNICEF是因为这台机器是为UNICEF所组织的一个活动而设计制造的。故选B。

　　【细节理解题】

　　细节题的破解一般采用寻读法，即先看试题，再读文章。对有关信息进行快速定位，再将相关信息进行整合、甄别、分析、对比，有根有据地排除干扰项，选出正确答案。寻读法还特别适用于对图形表格类题材的理解。做此类型的题目还要特别注意句子的逻辑关系。英语中有许多功能词，如：表因果关系的because, since, as等；表转折关系的but, however ,on the contrary, on the other hand等等。29小题B细节理解题。由第五段中的The amount of water it produces depends on ... just about a mouthful可知，这台机器的产水量太少了，故选B项。

　　考点：考查科技类阅读

　　D

　　“Cleverness is a gift while kindness is a choice. Gifts are easy – they’re given after all. Choices can be hard.” –– Jeff Bezos.

　　I got the idea to start Amazon 16 years ago. I came across the fact that the Internet usage was growing at 2,300 percent per year. I’d never seen or heard of anything that grew that fast, and the idea of building an online bookstore with millions of titles was very exciting to me. I had just turned 30 years old, and I’d been married for a year. I told my wife MacKenzie that I wanted to quit my job and go to do this crazy thing that probably wouldn’t work since most start-ups don’t, and I wasn’t sure what to expect. MacKenzie told me I should go for it. As a young boy, I’d been a garage inventor. I’d always wanted to be an inventor, and she wanted me to follow my passion.

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