单项选择题

Acute hearing helps most animals sense the approach of thunderstorms long before people_______.

A．do
B．hear
C．do them
D．hearing it
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单项选择题
They are put to work when young, and they stay ______.
A．to
B．down
C．up
D．put
单项选择题
A great amount of work has gone into ______the Cathedral to its previous splendor.
A．refreshing
B．restoring
C．renovating
D．renewing
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