B．the phone cover will break down easily in the soil which you bury it in

　　C．it will be recycled by the manufactures

　　D．it can recharge itself in an environment­friendly way

　　答案：B　细节理解题。根据第三段第三句“Overtime it can also break down into the soil without giving out any toxic chemicals.”可知，应选B项。

　　6．Which of the following is wrong about the cover of the new type of phone?

　　A．It can provide useful fertilizer (肥料) for the sunflower seed after the mobile phone breaks down.

　　B．It looks like normal plastics but it can break down.

　　C．It can serve as the storage for the sunflower seed.

　　D．It makes sure the seed only grows after the phone is thrown away.

　　答案：D　细节理解题。根据第四段可知选项D是a small transparent window的功能，而不是the cover的功能。故选D项。

　　7．This type of research is done because ________.

　　A．the technology that produces mobile phones is changing rapidly

　　B．consumers tend to throw away their mobile phones within two years

　　C．nobody has ever thought of recycling mobile phones

　　D．producing mobile phones uses a lot of energy, so this has become a very big problem for the environment

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