仔细观察王梅去天津的往返车票，回答下面的问题。

Wang Mei went to see her grandparents in 2007. Here are the two tickets (票) Wang Mei bought.

1. Where do Wang Mei's grandparents live?

    _____________________________________

2. When did Wang Mei go to Tianjin?

    _____________________________________

3. How much were the two tickets? 

    _____________________________________

4. Did Wang Mei sit on the train (火车)?

    _____________________________________

5. How many days did Wang Mei stay in Tianjin? 

    _____________________________________

矿井发生透水前有挂红、挂汗、（）和有害气体增加等出水预兆。

A、风速减小

B、水叫声、水色发浑、压力水流

C、风速增加

D、响声、片帮、掉渣