D．environment problems

　　答案：D　细节理解题。根据第三段第二句“Some are calling for international regulations to safeguard the environment as ship traffic increases (see page 157).”可知D项正确。

　　3．Which page of Nature deals with the green development around the Arctic ________？

　　A．Page 172.B．Page 174.

　　C．Page 179.D．Page 157.

　　答案：C　细节理解题。根据第三段中的“...and what scientists should do to keep Arctic development green (see page 179) and peaceful (see page 180).”可知答案。

　　4．It can be inferred from the text that ________.

　　A．scientists might help locals to be heard in terms of environmental changes

　　B．local people reject international cooperation in the Arctic

　　C．no country in the Arctic has territorial claims

　　D．scientists from different countries will cooperate in the Arctic before long

　　答案：A　推理判断题。根据第三段最后两句“Both research and development need to consider the views of local people, and scientists are learning how to do so (see page 182). Locals can provide insight into environmental changes.”可推知A项正确。

　　B

　　Robots have proved to be valuable tools for soldiers, surgeons and homeowners hoping to keep the carpet clean. But in each case, they are designed and built specifically for the job. Now there is a movement under way to build multipurpose machines—robots that can move about in changing environments such as offices or living rooms and work with their hands.

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