甲、乙两辆汽车同时从相距540千米的东、西两地出发，相向而行．甲车每小时行60千米，乙车每小时行40千米．
①出发后多长时间两车相遇？
②相遇后继续行驶，分别到达对方的出发地，甲、乙两车又各用了多少小时？
③相遇后继续行驶，分别到达对方的出发地，乙车比甲车多用了多少小时？
④相遇时，甲车所行的路程是乙车所行路程的几倍？
—Don't do any other things while you are having a class. So please _______ your MP3.
—Sorry, I will do it right now.
下列四种调查：①调查某班学生的身高情况；②调查某城市的空气质量；③调查某风景区全年的游客流量；④调查某批汽车的抗撞击能力．其中适合用全面调查方式的是（ ）
IT'S MY BIRTHDAY
Ann hopes you can come to her birthday!
Time
Twenty to six in the afternoon
Date
Monday, July 14th
Place
Flat 9B West Wing Tower
Phone
875-4615
Note
The more friends, the better.
