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题型：单选题 题类：常考题 难易度：普通
人教版（PEP）小学英语四年级下册 Unit 2 What time is it Part A同步测试（二）
A. Don't throw stones.
B. Don't litter.
C. Don't play on the grass.
D. Don't pick flowers.
E. Don't open the gate.
F. Don't swim in the river (河).
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