单项选择题
A.2 B.3 C.4 D.Not available in the paragraph
How many tons does the cargo 737 carry?（）A.100 tons ...
单项选择题How many tons does the cargo 737 carry?（）
A.100 tons B.Not clear C.More than 100 tons D.I don’t know
Where is the most air freight shipped in the passenger ...
单项选择题Where is the most air freight shipped in the passenger aircraft?（）
A.Separately B.In same level C.In the lower part D.Not mention here
How much is the percent of air transportation in all mo...
单项选择题How much is the percent of air transportation in all modes?（）
A.Less than 1% B.Lowest C.Lower D.Low
