German zoologist Randolf Menzel says bees aren’t as busy as people believe they are. "Bees are not particularly【C1】______. Inste

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问题     German zoologist Randolf Menzel says bees aren’t as busy as people believe they are. "Bees are not particularly【C1】______. Instead they sleep a lot and are lazy. They spend【C2】______80 per cent of the night sleeping. Even during the day they often fly to the nest【C3】______they rest their wings. " said Menzel, a zoologist at the Free University in Berlin, who has studied bees for four decades. But to【C4】______for their apparent laziness, they are actually very intelligent. They are【C5】______learners and able to recognize various smells.
    Menzel said bees’ learning, like【C6】______of many animals, was based on a reward system. "If a bee is rewarded once for something, it remembers it for a week. But if it is rewarded three times, it will remember it for its【C7】______lifetime. " Said Menzel. He last week was awarded a【C8】______by the German Zoological Society.
    The memory capacity of bees means they can【C9】______among more than 50 different smells to find the one they want. "What is interesting is that what smells good to a bee, is also a【C10】______smell for humans. " said Menzel.
【C6】

选项 A、those
B、which
C、that
D、what

答案C

解析 由此句的主语(蜜蜂的知识学习)可知,此处需要填入代词,由于代替的是learning,因此,只有that能代替不可数名词的learning,故C是正确答案。
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