--He was a great brother. He held the whole family.
A:support
B:owner
C:hero
D:brother
想:先算6加7得____;再把30和____合起来,得____.
(先填 ,再从左到右填写括号)
.如图,把矩形ABCD沿EF对折后使两部分重合,若∠1=50°,则∠AEF=____ 。