题目

从给出的选择适当的句子补全对话。 A. The red one is a pen.B. What's this?C. 1, 2. . . I see 5.D. How many pencils do you have?A:1.________B:It's my new pencil box.A:2.________B:Open it and see.A:3.________B:No. I only have four pencils. 4.________ A:Oh, yes. Four pencils. 答案：【答案】1.B 2.D 3.C 4.A 【解析】略如图，点C是AB上一点，O是圆心，且∠AOB=120°，则∠ACB=    度．