听材料,回答以下各小题。
18. How does Bob come to the town?
A.By train. | B.By bus. | C.By taxi. |
19. Why does Bob come to the town?
A.Visit a factory. | B.Visit a friend. | C.Do a research. |
20. Who does Bob ask the way to the factory?
A.A worker. | B.A teacher. | C.A student. |