题目

Drones are like airplanes, only without a pilot. No one without a pilot’s license should be allowed to have one. Something bad or unexpected can happen when people send up a self-controlled flying machine like a drone without knowing how to really control it. Drones can become flyaways, and can be caught up on a jet stream (喷气流) and blown away. A falling drone can do much damage (损害) to buildings and people.Though drones can be harmful, they can be very helpful. At a sports event, drones can be used to give the spectators (观众) a view from above or help coaches see how their pla老师带领三年级学生去科技园参观，其中有8位老师，125名学生．