雨滴在空气中下落，当速率在不太大的范围内时，雨滴所受到的阻力与其速率成正比．该速率v随时间t做怎样的变化?从图中选取一个最适当的答案 ( )
I'm doing a survey． Could you tell me ？
Sure． I usually go to work at 7：00 am．（ ）
when do you go to work
how you go to work
when you go to work
is quite easy for people to find any place in the world with the help of online maps．（ ）
That
It
One
It's already 7：50． If you want to get to the meeting on time， you must ， Jack．
I see． I'll walk quickly．（ ）
hurry up
ring up
stay up
What should I do， doctor？
healthy， you should take more exercise．（ ）
Keep
Keeping
To keep
Can you kick the ball to end of the football field？
It's hard for me． I think few goalkeepers can make it．（ ）
another
the other
other
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