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【简答题】
甲骑自行车从A地到B地，自行车从B地到A地，两人都匀速前进．第一次相遇在距A地18千米处．相遇后两人继续前进，各自到达目的后立即按原路返回出发地，第二次相遇在距A地36千米处．求A、B两地间的距离．
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举一反三
【单选题】To make a living,they are willing to_________many of the disadvantages of city life such as crime, heavy traffic , and pollution. [ ]
A.
put up
B.
put off
C.
put up with
D.
put away
【单选题】I first met Lily five years ago. She ___ as a nurse in a hospital at the time.
A.
was working
B.
has worked
C.
had been working
D.
had worked
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