单项选择题

Whenever I go out, I always keep a certain amount of money _________, in case of an emergency.

A．by hand
B．in hand
C．on hand
D．at hand
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单项选择题
The headlights of the approaching car were so _________ that the cyclist had to stop riding.
A．blazing
B．blessing
C．blurring
D．dazzling
单项选择题
According to biologists, animal populations at a given time are _________ by food supplies at that time.
A．governed
B．sustained
C．mediated
D．manipulated
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