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单选题英语六级

2017-03-11

A．They were carried by the wind.

B．They had become more poisonous.

C．They were less than on the continent.

D．They poisoned some of the fulmars.

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参考答案

What did scientists previously notice about pollutants in the Arctic?
A。短文中提到，以前科学家们就注意到，风可以将污染物带至北极，故答案为A。

A．The threats humans pose to Arctic seabirds,

B．The diminishing colonies for Arctic seabirds.

C．The harm Arctic seabirds may cause to humans.

D．The effects of the changing climate on Arctic seabirds.

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A．It has decreased.

B．It has been exaggerated.

C．It has become better understood.

D．It has remained basically the same.

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A．It develops more easily in centenarians not actively engaged.

B．It is now the second leading cause of death for centenarians.

C．It has had no effective cure so far.

D．It calls for more intensive research.

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