A:though
B:if
C:while
D:because
My room is a mess, but I __________clean it before I go out tonight. I can do it in the morning.
与小肠吸收面积大无关系的特点是( )
如图,在平面直角坐标系中有Rt△ABC,∠A=90°,AB=AC,A(﹣2,0)、B(0,1)、C(d,2).
我国封建土地剥削制度被彻底废除的事件是( )