The explosion of movement refers to______.

A．It is not easy to get them away from the computers.
B．They are going all over the world with their teachers.
C．They don’t even want to go to class any more.
D．They are going to visit some libraries on earth.

A．He enjoyed using his new camera.
B．He left his camera at the airport.
C．He left his camera in his friend’s ear.
D．He lost his camera on his trip.