阅读短文，回答问题。
    Rose's summer holiday is coming soon. Her family loves to go on trips in summer. Last summer, she went to a lake with her parents. She swam in the lake and played on the beach.
    This summer she will go on a trip to the sea with her grandfather and grandmother. She will swim in the sea. She will watch the ships on the sea. She will be happy for the summer holiday.

地球自转360°的周期和时间为（　　）

①1个恒星日

②1个太阳日

③23小时56分4秒

④24小时．

下表是稀硫酸与某金属反应的实验数据：

实验序号	金属质量/g	金属状态	c（H2SO4）/mol．L﹣1	v（H2SO4）/mL	溶液温度反应前/℃		金属消失的时间/s
					反应前	反应后
1	0.10	丝	0.5	50	20	34	500
2	0.10	粉末	0.5	50	20	35	50
3	0.10	丝	0.7	50	20	36	250
4	0.10	丝	0.8	50	20	35	200
5	0.10	粉末	0.8	50	20	36	25
6	0.10	丝	1.0	50	20	35	125
7	0.10	丝	1.0	50	35	50	50
8	0.10	丝	1.1	50	20	34	100
9	0.10	丝	1.1	50	20	44	40

分析上述数据，回答下列问题：

补全对话。

A：Hi，Mary !Have you been to Beihai Park

B：Yeah!I have been there many times

A：____

B：It's a good place to relax．

A：____

B：It's famous for its lake．

A：____

B：No．they can't．

A：That's too bad．

B：Oh, no!It's not bad．It's good for them．____

A：I see．What else can we do in the park?

B：We can climb the hills．

A：That sounds great!____

B：That's a good idea．

A．Do you often have a great time there? B．What about going there this weekend? C．What's the park famous for? D．Swimming in the lake is not safe． E．Can visitors swim in the lake?

It is thoughtful ________him ________his CDs for us.