单项选择题


A．leave
B．lag
C．follow
D．lack
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单项选择题
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
单项选择题
A．HoweverB．In additionC．By contrastD．Therefore
A．However
B．In addition
C．By contrast
D．Therefore
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