My headache _________ me. I thought it was going away, but now it's getting worse.
A:killed
B:kills
C:is killing
D:has killed
(Ⅰ)求证:MD和NE互相平分;
(Ⅱ)若BD⊥AC,EM=2 2 ,OD+CD=7,求△OCB的面积.
小强身高1m,爸爸身高170cm,爸爸和小强身高的比是17∶10.