B.the study of the health of caribous
C.the impact of working in polar regions
D.the reduction of polar scientists' carbon emissions
68.What did Brook find when he calculated his own carbon footprints?
A.His carbon footprints are more than the annual footprints of a Toronto resident.
B.His personal life footprints are more than the annual footprints of a Toronto resident.
C.His research footprints are about the same as his personal life footprints.
D.His personal life footprints are more than his research footprints.
69.Brook's opinion is challenged by the statement that____.
A.arctic research is very important
B.the Arctic is a special environment
C.the footprints of Arctic scientists are small
D.Brook's situation is not a common phenomenon
70.We can infer from the last paragraph that________.
A.we should take actions immediately instead of just talking
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
答案与解析
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