-How much is the ticket to Central Park?
-A one-way ticket __________ $ 40, and you can __________ another $ 20 for a round-trip.
A:costs; pay
B:cost; spend
C:pay, spend
D:spends, pay
对于流入市场的假币,人们长借助验钞机发出的____来辨别真伪;彩色电视机画面上的色彩是由红、____、蓝三种色光混合而成.