1、After crude oil is extracted from a well, it is usually piped to a refinery.(单选题)
A. unrefined
B. toxic
C. transparent
D. turbid
试题答案:A
2、______(单选题)
A. factors
B. ingredients
C. composers
D. facts
试题答案:B
3、______(单选题)
A. disputes
B. changes
C. arguments
D. calls
试题答案:B
4、No adults would like to admit that they are weaker than children to solve sticky and puzzling problems.(单选题)
A. to solve about
B. solve
C. in solving about
D. in solving
试题答案:D
5、______(单选题)
A. Oil
B. Exhaust
C. Smoke
D. Gas
试题答案:C
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