7Unit 9第三题第1题答案
8Unit 9第三题第2题答案
① Are these your rulers?
② No, they aren't.
9Unit 9第三题第3题答案
10Unit 9第三题第4题答案
① Close
② these
③ Are,aren't
④ Is this,it is
11Unit 9第三题第5题答案