research is very important РB. the Arctic is a special environment РC. the footprints of Arctic scientists are smallРD. Brook’s situation is a common phenomenonР69. We can infer from the last paragraph that________. .РA. we should take actions immediately instead of just talkingРB. it’s easy to start talking about the problem of carbon emissions РC. it’s necessary now to pay attention to the problem of research footprintsРD. the next generation of scientists are more interested in research footprints.Р70. What’s the main idea of the text?РA. The importance of arctic research is not a question.РB. Climate change becomes worse because of arctic research.РC. Brook suggests ways of reducing the use of carbon.РD. Scientists must mind their own carbon footprints.Р参考答案：Р66----70 BACCDР略
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