3千克=______吨3千米400米=______米．
（1）3千克=0.003吨，
（2）3千米400米=3400米．
故答案为：0.003，3400．
— What are they doing?
— They are __________ on the computer.[ ]
A. work
B. works
C. working
D. to work
Our football team will never take the defeat ____ down.
A. sitting B lying C. going D. climbing
