单项选择题

______ some flowers contain more nectar than others, how does a honeybee worker, faced with a patch of flowers containing variable amounts of nectar, decide when to stop collecting

A．Given that
B．Though
C．If
D．while
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Some children display an ______ curiosity about every new thing they encounter.
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B．infectious
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His heroic public image was seriously ______ by the rumor.
A．detracted
B．distracted
C．retracted
D．subtracted
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