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 re­aimed 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 thirty­two 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.

　　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

　　2．From this passage we know that ________.

　　A．there is no wood for people to use while making a fire now

　　B．people have been using solar cookers for more than 200 years

　　C．solar energy is the cleanest energy on the earth

　　D．more and more people cook food on smoky fires

　　3．Parabolic cookers may be dangerous to us because ________.

　　A．they may direct electricity to us humans

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