单项选择题

Australia provides the only separate, ______ laboratory in which dramatic Quaternary extinction occurred.

A．natural continent-sized
B．natural and continent-sized
C．continent-sized natural
D．continent-sized and large

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单项选择题

The preservation of opportunity in the face of unforgiving tradeoffs, and the capacity to exercise a degree of freedom to pursue one' s talent, ______ me as a centrally important principle in the emerging society.

A．terrify
B．stir
C．strike
D．spur

单项选择题

Such initiatives can pay generous dividends in a continent ______ a large and talented scientific community which, although largely educated in the United States and in Europe, is strongly inclined to return home to do science.

A．bloomed with
B．blocked with
C．blessed with
D．blocked by

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