Tell your friend not to take the pills _______ he may have health problems in the future, _______ it is too late.
A:cause; which
B:that; when
C:because; when
D:that; which
如图,在⊙O中,AC与BD是圆的直径,BE⊥AC,CF⊥BD,垂足分别为E、F
(1)四边形ABCD是什么特殊的四边形?请判断并说明理由;
(2)求证:BE=CF.
结合语境解释下面句子中的加点词语有误的是( )
请对他们的观点进行辨析。