What is the transportation like in Beijing?
A. Which means of transportation do you like best
B. How is the transportation
C. How is the transportation like
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What kind of transportation do you use most often?
A. What vehicle
B. How many means of transportation
C. Which means of transportation
I've been here for only two weeks.
A. since only two weeks
B. since only two weeks ago
C. in only two weeks
It took me some time to learn the American way of living.
A. I spent some time learning
B. It cost me a lot of time to learn
C. I paid some time to learn
指出下列平面的特点：1） 2x+3y=02)x-y-z=03) 2y-3z-4=04) y-3=0
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