问题
单项选择题
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
答案
参考答案：C
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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
参考答案：C