A：Hello，Li Ming．What's your plan for this summer holiday？

B：I have no idea． ____

A：I'll take part in a social activity with my sister．

B：It sounds exciting． ____

A：No．I have been a volunteer in a poor village．The children there don't have money to buy books．

B： ____

A：Yes．I bought them 30 books with my pocket money．

B：What else did you do there？

A： ____And now we are good friends．

B：Wow! ____I'd like to join you．

A：Great! I'm sure we'll have a meaningful holiday．

小明家购买新房后，进行了装修．

已知：如图，AB是⊙O的直径，CD是⊙O的弦，AB，CD的延长线交于E，若AB=2DE，∠C=40°，求∠E及∠AOC的度数．

甲、乙两地相距120千米，客车和货车同时从甲地出发驶向乙地，客车到达乙地后立即沿原路返回，在途中的丙地与货车相遇．之后，客车和货车继续前进，各自到达甲地和乙地后又马上折回，结果两车又恰好在丙地相遇．已知两车在出发后的2小时首次相遇，那么客车的速度是每小时多少千米？