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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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

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