A:教师与学生
B:旅行社的导游人员
C:旅游点的服务设施
D:北京的自然景观和人文景观
This is an oil painting.
The teacher doesn't allow us the dictionary in the test.
某果园的苹果品质差、产量低,果农想尽快更换为优质高产苹果树,你的合理化建议是( )