张华在新华书店买了2本《故事大王》和2盒磁带,共用去36元,每盒磁带8元,每本《故事大王》多少元?
(36-8×2)÷2
=20÷2
=10(元)
答:每本《故事大王》10元.
How many animals are there ________ the farm?[ ]
A. on
B. in
C. at
D. to
牙科用椅(不带牙科用设备)