单项选择题


A．anniversary
B．each
C．annual
D．every
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A．leaveB．lagC．followD．lack
A．leave
B．lag
C．follow
D．lack
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By saying Spring is usually prime food time for 1,200 polar bears ( Line 1, Para. 1 ), the author means that ______.
A．spring is usually a good time for polar bears to carry out their mating rituals
B．the polar bears usually eat a lot in the spring
C．spring is generally a good time to hunt polar bears
D．polar bears usually hibernate in the spring
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