—____________ is it from your home to your school?
—It takes me about 20 minutes by bus.
A:How long
B:How far
C:How quick
D:How much
肾脏 ____ A血液循环的动力器官
心脏 ____ B形成尿液
大脑皮层 ____ C气体和食物的共同通道
膀胱 ____ D神经活动的最高级中枢
咽 ____ E暂时储存尿液
已知:平行四边形ABCD,E是BA延长线上一点,CE与AD、BD交于G、F.
求证:CF2=GF•EF.