单项选择题
Crude oil carriers often use （）
A. Big ships
B. Huge ships
C. Large container ships
D. Supertankers
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A. Most inexpensive
B. Save money
C. Low cost
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What is the meaning of Metropolitan area? （）
A. Around the city
B. City itself
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单项选择题
Railroads own about （）of their car fleet.
A.Half
B.80%
C.20%
D.Not mentioned
