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survivor—survivors
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单项选择题
The sharp rise of the snow geese population is mainly caused by ______.
A．lack of natural enemies
B．great care of wildlife preservationists
C．favorable conditions in their winter habitat
D．changes in their migration patterns
单项选择题
The increase in the numbers of married women employed outside the home in the 20th century was NOT due to ______.
A．their economic necessity
B．more women employers
C．shortage of single women workers
D．high marriage rates
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