排序。
A. Oh, what's the matter?
B. I'm sorry. Are you ill?
C. Good morning! How are you?
D. I'm tired.
E. No, I'm not ill.
F. Thank you very much.
G. Not so good.
H. Here's a chair for you.
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如图,已知在Rt△ABC中,∠ABC=90°,点D是BC边的中点,分别以B、C为圆心,大于线段BC长度一半的长为半径圆弧,两弧在直线BC上方的交点为P,直线PD交AC于点E,连接BE,则下列结论:①ED⊥BC;②∠A=∠EBA;③EB平分∠AED;④ED=12AB中,一定正确的是( )
两宋时期经济重心南移的原因和表现。