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When the mixture is used, it is important to______.
A.keep sugar and salt in water
B.drink it as often as necessary
C.take it as much as possible
D.use it to kill the bacteria
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