单项选择题

Which of the following does NOT pertain to the "support services" mentioned in the passage

A．Telecommunications systems.
B．Universities for training business administrators.
C．Sources of industrial tools.
D．Reservoir of labor forc
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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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