问题
单项选择题
What are transported mainly by water? （）
A. Raw materials
B. Heavy, bulky and low value commodities
C. Semi-processed
D. Great amount goods
答案
参考答案：B
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What are transported mainly by water? （）
A. Raw materials
B. Heavy, bulky and low value commodities
C. Semi-processed
D. Great amount goods
参考答案：B