题目内容
Which sign means that you must wear a mask(口罩) ________.
A. B. C.
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The students of after-zero have different ways to relax themselves. The chart shows the result of the survey among 400 students. The number of the students who play computer games is ________.
Read books | Listen to music | Play computer games | Play ball games |
20% | 100 | ? | 30% |
A.80 B.100 C.120