-- they have a basketball?
-- No, they don’t have .
A:Are; one
B:Are; a
C:Do; one
D:Do; a
学校召开家长会,请了264位家长,8人围坐一桌,需准备多少张桌子?
已知函数f(x)=log2(3+x)﹣log2(3﹣x),