平行四边形、矩形、菱形、正方形都具有的性质是 [ ]

A．对角线相等

B．对角线互相平分

C．对角线平分一组对角

D．对角线互相垂直

根据对话内容和首字母提示，在每个空缺处填入一个适当的词，使整段对话意思完整

(每空限填一词)。

A: Hi, Kate.

B: Hi, Bill.

A: What are you going to 1_______ next Sunday?

B: Nothing much. What 2_______ you?

A: 3_______ go to the zoo. I hear there's a dolphin show in the zoo.

B: A dolphin show? 4_______ idea! How can we 5_______ there?

A: By bus 6_______ by bike?

B: OK. Let's go by bike. 7_______ shall we meet?

A: What about nine-thirty?

B: 8_______ OK.

A: 9_______ shall we meet then?

B: At the zoo gate, OK?

A: OK. See you 10_______.