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【简答题】
Alice is at school now. She misses her family and old friends very much. She tries her best to keep in touch with them. She phones her parents on weekends and writes to her grandparents every month. She also calls her old friends or chats with them online. Now she has many new classmates. She hopes she will make more friends at her new school.
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【简答题】正方形的四条边相等，四个角都是直角．______．（判断对错）
【单选题】我们知道，正方形的四条边相等，四个角也都等于90°，如图，在正方形ABCD外取一点E，连接AE、BE、DE，过点A作AE的垂线交DE于点P，若AE=AP=1，PB= 。下列结论： ①△APD≌△AEB；②EB⊥ED；③点B到直线AE的距离为 ；④S △APD +S △APB = 。 其中正确结论的序号是 [ ]
A.
①②③
B.
①②④
C.
①③④
D.
②⑨④