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题型:语法填空-短文语填 难度:0.65 引用次数:137 题号:14501411
阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。

Scientists in Australia have found that honeybees seem to understand the idea of zero. This is     1     (surprise) since bees have very small brains. So far only a few animals with larger brains     2     (show) this skill. And humans don’t     3     (usual) understand it until they’re around four years old.

The scientists created an experiment to test     4     honeybees understood the idea of “zero” or not. First, they trained the bees by rewarding (奖赏)     5     (they) with sugar water for choosing smaller numbers. The scientists hung up cards with different numbers of shapes. Under each card was a tray (盘子). The tray under the smaller number had sugar water. The tray under the larger number had something sour. After about forty     6     (test), the bees had learned to choose the cards with smaller numbers of shapes. The bees knew how to look at the cards, “count” the shapes on each card, and choose the card     7     had the fewest shapes. Then came the interesting part. The scientists put out a card with nothing on it-zero shapes. When given a choice between two or three shapes     8     “zero” shapes, bees picked zero. This showed they knew that zero, or “none”, was     9    (little) than “some”. Just to be sure, the scientists trained other bees     10     (choose) high numbers. Those bees did not choose zero.

【知识点】 动物 科普知识

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