妈妈今年30岁,比小红大a岁,y年后妈妈比小红大多少岁?( )
A.a
B.a+y
C.30-a+y
D.y
y年后妈妈比小红大a岁,
答:y年后妈妈比小红大a岁.
故选:A.
Do you need shoes for sports _____ dance? [ ]
A. or
B. and
C. of
D. but
含油气盆地