是不是这个：
Bob is talking a history quiz at the museum.Listen and write T for true and F for false.
1.30 years ago,there were no bridges.(F)
2.30 years ago,there were some factories.(T)
3.50 years ago,there was no subway.(T)
4.Now there are two train station.(T)
5.There are twenty shopping malls.(T)
6.50 year ago ,there were not many people.(F) 是不是这个：
Bob is talking a history quiz at the museum.Listen and write T for true and F for false.
1.30 years ago,there were no bridges.(F)
2.30 years ago,there were some factories.(T)
3.50 years ago,there was no subway.(T)
4.Now there are two train station.(T)
5.There are twenty shopping malls.(T)
6.50 year ago ,there were not many people.(F)