阅读理解
Going to the zoo
The students of our School go to the zoo. They see a lot of animals. In the afternoon, they get back to school. The teacher asks them which animal is their favourite. Each student gives an answer. Some animals are very popular. Other animals are not. Here is a chart (图表) the students make at school. It shows the animals the students like best.
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,，纯虚数的个数有（ ）个