—Who's that boy?—He is my cousin, and _______ name is Jack.
A:my
B:her
C:his
D:our
“鱼儿离不开水”,对此最恰当的解释是( )
根据下列条件列出方程
(1)x比它的78大15
(2)2xy与5的差的3倍等于24
(3)y的18与5的差等于y与1的差.