听力原文:M: How much did you pay for this used book?W: I paid 4 dollars--half of its usual
听力原文:M: How much did you pay for this used book?
W: I paid 4 dollars--half of its usual price.
Q: What is the usual price of the book?
(8)
A.4 dollars.
B.7.5 dollars.
C.12 dollars.
D.8 dollars.