單項(xiàng)選擇題How many categories are there in water transport?（）

A. 2
B. 3
C. 4
D. Not available in the paragraph


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1.單項(xiàng)選擇題How many tons does the cargo 737 carry? （）

A. 100 tons
B. Not clear
C. more than 100 tons
D. I don’t know

2.單項(xiàng)選擇題Where is the most air freight shipped in the passenger aircraft?（）

A. separately
B. Not clear
C. In the lower part
D. Not mention here

3.單項(xiàng)選擇題How much is the percent of air transportation in all modes? （）

A. Less than 1%
B. Lowest
C. Lower
D. Low

4.單項(xiàng)選擇題what kind of products do the air carriers deliver? （）

A. The high value
B. Low density or weight
C. A and B
D. Shortest time to transport

5.單項(xiàng)選擇題What is the disadvantage for air transportation? （）

A. Quick but not safe
B. Less frequency
C. It can’t lift heavy goods
D. The highest cost in all transport modes