平行四邊形ABCD與平行四邊形PQRS重疊如圖所示，若∠B＝70°，∠S＝80°，∠2＝90°，則∠1＝？ (A)55°　 (B)60°　 (C)65°　 (D)70°

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23. 平行四邊形ABCD與平行四邊形PQRS重疊如圖所示，若∠B＝70°，∠S＝80°，∠2＝90°，則∠1＝？

(A)55°　
(B)60°　
(C)65°　
(D)70°

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