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B Listen and tick (听录音,勾出听到的句子)
1. a Sit down, please. b Stand up, please.
2. a Open the door, please. b Close the door, please.
3. a Clean the desk, please. b Close the book, please.
4. a Look at the blackboard, please. b Clean the blackboard, please.
1. a Sit down, please. b Stand up, please.
2. a Open the door, please. b Close the door, please.
3. a Clean the desk, please. b Close the book, please.
4. a Look at the blackboard, please. b Clean the blackboard, please.
答案：
1.a 2.b 3.a 4.a
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