根据统计,一名工人组装第件某产品所用的时间(单位:分钟)为(A,为常数).已知工人组装第4件产品用时30分钟,组装第A件产品用时15分钟,那么和A的值分别是( )
It about eight minutes for the light to travel from the sun to the earth.( )
pays
costs
spends
takes
We are happy to see our city is developing these years than before.( )
quickly
more quickly
very quickly
the most quickly.
Robots more heavy work for us in the future.( )
will do
did
have done
were doing
It is duty to protect the environment.( )
we
us
ours
our
So kind of you to give me a ride to the bus stop.
( )
My pleasure.
Never mind.
It doesn 't matter.
That's nothing to do.