人体的泌尿系统中,形成尿液的器官是____ ,人体每天形成的原尿约有180升,而排出的尿液只有1.5升左右,这主要是因为____ 进行了重吸收作用.
﹣ It is reported that cancer can be controlled at a temperature lower than 100℃below zero.
﹣ Really? ______ nice surprise!
—Yes, I watched at eight last Saturday.
如图,在正六边形ABCDEF中,△BCD的面积为4,则△BCF的面积为( )