The third kind of solar oven is a parabolic (抛物线的) cooker.It has rounded walls that aim sunlight directly into the bottom of the oven.Food cooks quickly in parabolic ovens.However，these cookers are hard to make.They must be reaimed often to follow the sun.Parabolic cookers can also cause burns and eye injuries if they are not used correctly.

　　You can make solar ovens from boxes or heavy paper.They will not catch fire.Paper burns at two hundred thirtytwo degrees Celsius.A solar cooker never gets that hot.Solar ovens cook food at low temperatures over long periods of time.This permits people to leave food to cook while they do other things.

　　【解题导语】　本文是一篇说明文。文章主要讲述了使用太阳能做饭这一现象。太阳能的使用已经有很久的历史了，1767年一个瑞士人发明了世界上第一台太阳能烤炉。现在世界上很多国家的人们都使用太阳能做饭。文章还介绍了三种太阳能炉的不同构造及特点。

　　1．Which of the following should be the best title for this text?

　　A．Cooking food with solar energy

　　B．How to make solar cookers

　　C．Introduce a new kind of energy

　　D．Different kinds of cookers

　　解析：选A。主旨大意题。综合全文的内容我们可以看出，本文主要讲述了使用太阳能做饭这一现象。全文始终是围绕这个主题展开的。据此我们可以确定本题答案为A。

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