单项选择题

With what subject is the passage mainly concerned

A．The bee, a social animal.
B．Navigational techniques of bees.
C．Testing the awareness of bees.
D．The bee hive, nature's candy shop.
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单项选择题
According to the passage, sugar was used in the study to ______.
A．feed the bees during the experiment
B．make the bees live in groups
C．reward the bees for good performance
D．train the bees to travel to a particular place
单项选择题
What does the word raise (Line 3, Para. 3) mean
A．Bring up.
B．Collect.
C．Put on.
D．Lift.
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