下列图示所表示的事实中不能说明地球真实形状的是（　　）

如图，四边形ABCD中，∠A=∠C=90°，BE平分∠ABC交CD于E，DF平分∠ADC交AB于F．

（1）若∠ABC=60°，则∠ADC等于多少？∠AFD等于多少？

（2）求证：BE∥DF．

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