听力原文:W. Oh, what a nice bicycle, Peter! M: Yes, I've just bought it. W: Is it expensive? M: Not really. Only 90 dollars. How much did Peter pay for his new bicycle?
A.
9 dollars.
B.
19 dollars.
C.
90 dollars.
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【单选题】Before welding in a tank that has carried petroleum products,the tank must be certified by ().