—________
—Because ________.
—Yes. The smoke makes the air d.
A. It makes the air dirty.
B. We should ride a bike more often.
C. The air is clean and fresh there.
D. It's from factories, cars and buses.
E. I'm going to the Huangshan Mountain.
Lily: Where are you going this winter holiday?
Mike:
Lily: That's a good idea.
Mike: Yes. Look at the smoke in the sky. Where is the smoke from?
Lily:
Mike:We need to do something to keep the air clean. What should we do?
Mike:That's right.
keep make live alive clean smoke plant
A. a parachute (降落伞)
B. a sailing boat
C. a hot-air ballon
D. a kite
Air