单项选择题

Ocean transport use （）ships mostly.

A. Bulk
B. Container
C. Barge
D. RO/RO

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单项选择题

A. Big ships
B. Huge ships
C. Large container ships
D. Supertankers

单项选择题

A. Most inexpensive
B. Save money
C. Low cost
D. Economically

单项选择题

A. Around the city
B. City itself
C. The area near the city
D. Big city and its neighbor area