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.

　　解析：推理判断题。根据第5段的“My research footprints are about the same as the annual footprints...I have two footprints—my own personal life...and my research footprint.”可知Brook的carbon footprints(personal life footprint＋research footprint)比“the annual footprint of an average Toronto resident”多。

　　答案：A

　　3．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

　　解析：细节理解题。根据第6段内容可知：反对者认为即使他们减少了因为研究工作产生的碳，也不会对全球产生什么影响，因为进行北极研究的科学家人数相对较少

　　答案：C

　　4．We can infer from the last paragraph that ________.

　　A．we should take actions immediately instead of just talking

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