单项选择题

______of half starving foxes were roaming the snow covered mountain areas.

A. Herds
B. Packs
C. Flocks
D. Crowds
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First published in 1927, the charts remain an______source for researchers.
A. intelligent
B. indispensable
C. inevitable
D. identical
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Just as the soil is a part of the earth,______the atmosphere.
A. as it is
B. so is
C. the same as
D. and so is
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