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
Finally, careful prioritization is no alternative to the adequate ______ of the science base.
A．funding
B．including
C．excluding
D．expending
单项选择题
Perhaps the only ______ that physicists have are, for big science, the cultural appeal to the public of fundamental laws of nature and of the Universe.
A．alley
B．allies
C．alloy
D．allergy
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