_________ your parents _________ bananas?
A:Do, like
B:Does, like
C:Do, likes
More historical buildings in the old town will fall down________we try our best to protect them.
下列有关生物生殖和发育的说法,正确的是( )
两个质量相等质地均匀的实心球甲和乙,它们的体积之比V甲:V乙=1:3,则它们的密度之比ρ甲:ρ乙=____ ;现将甲、乙两球放入装有足够深的水的容器中,当它们静止时,水对两球的浮力之比为F甲:F乙=2:3,则乙球的密度为ρ乙=____ kg/m3.