It's bad for health to hurry to move into a house ___________ has new furniture in it.
A:who
B:where
C:that
补全句子:It's ____and snowy in winter.
(I)求出动点P的轨迹对应曲线C的标准方程;
(Ⅱ)一条纵截距为2的直线 l1 与曲线C交于P,Q两点,若以PQ直径的圆恰过原点,求出直线方程.
(2015•鄂尔多斯)如图为花的结构示意图,下列叙述正确的是( )