选用所给的单词填空。
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有关我国人口政策的叙述正确的是( )
如图,四边形ABCD为矩形,E是BC延长线上一点,AE交CD于点G,F是AE上一点,并且AC=CF=EF,∠AEB=15°.
(1)求∠ACF的度数;
(2)证明:矩形ABCD为正方形.
The children expect the new cartoon soon.