B．it's easy to start talking about the problem of carbon emissions

　　C．it's necessary now to pay attention to the problem of research footprints

　　D．the next generation of scientists are more interested in research footprints

　　解析：推理判断题。根据最后一段的but we need to start talking about it可知答案。

　　答案：C

　　5．What's the main idea of the text?

　　A．The importance of arctic research is not at question.

　　B．Climate change becomes worse because of arctic research.

　　C．Brook suggests ways of reducing the use of carbon.

　　D．Scientists must look at their own carbon footprints.

　　解析：主旨大意题。本文主要介绍了一位科学家通过关注自己在北极地区研究时所产生的二氧化碳问题，从而提出了所有的科学家在北极地区工作时，要注意自己产生的碳排放的问题。

　　答案：D

　　B

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