单项选择题
W: These are very nice shirts. How much are they M: $ 5 each. For two, $ 9.
A. $ 4.50. B. $ 5.00. C. $ 9.00. D. $13.50.
A. What the flight number is. B. Where to find a telephone. C. What time the flight departs. D. Where to board the plane.
A.10%. B.20%. C.30%. D.40%.