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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单项选择题
It can be inferred from the passage that, before the Industrial Revolution, most women worked in ______.
A．textile mills
B．private households
C．offices
D．schools
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
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