The inputs are cheap: maintaining the required temperature takes little energy because microbes produce heat as they work, and the only outputs are water and tiny levels of carbon dioxide.

　　"Almost every week I have to do chores and when I open the closet door, I have piles of plastic bags falling on top of me. One day, I got tired of it and I wanted to know what other people are doing with these plastic bags. The answer: not much. So I decided to do something myself." said Daniel Burd.

　　53．Daniel Burd won first prize at the Canada-Wide Science Fair because ____.

　　A．he found a new kind of microorganism

　　B．he contributed much to environmental protection

　　C．he found a way to degrade plastics in shorter time

　　D．he could encourage microbes growth in an easier way

　　54．Daniel Burd exposed one plastic sample to dead bacteria to

　　A．make the live bacteria work better

　　B．test how effective his method was

　　C．know which bacteria worked faster

　　D．control the temperature in the process

　　55．Maintaining the required temperature takes little energy because ____.

　　A．plastics can get hot easily

　　B．microbes can produce heat themselves

　　C．much carbon dioxide is produced

　　D．the temperature can be controlled

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