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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 4 At the farm Part A 同步测试（一）
—They are cows.
A．Yes, they are.
B．Yes, it is.
C．No, they aren't.
D．No, it isn't.
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