单项选择题

Three-thirds of the surface of the earth ______ se

a.A. wasB. areC. isD. were
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单项选择题
There was a(n) ______idea that the earth was flat and motionless.
A. ridiculous
B. silly
C. absurd
D. interesting
单项选择题
Car drivers must ______ to the rules of driving.
A. adhere
B. abide
C. conform
D. comply
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