单项选择题
[听力原文] M: This blue pencil is 50 cents and that black one is 10 cents more. W: The yellow one is twice as much as the black one.
A.60 cents. B.100 cents. C.120 cents. D.240 cents.
A.Wait for Mr. Jones. B.Write a note to Mr. Jones. C.Return Mr.Jones notebook. D.Give a message to Mr. Jones.
A.Half an hour. B.An hour. C.One hour and a half. D.Two hours.