A:第一象限
B:第二象限
C:第三象限
D:第四象限
—Hello! This is David. Can I speak to Tom? —Yes, ___________.
Envy is a ____(普遍的,全体的) weakness of people.
如图,AB是⊙O的直径,点D在AB的延长线上,DC切⊙O于点C,若∠A=25°,则∠D等于____ .