题目

We were finishing the first lesson, just Lori and me. We had spent the _______ taking baby steps. She had led me down the shallow wheelchair-access slope into the pool, _______me to take a step deeper, and then another.I had been afraid of water my whole life. At age forty-four, I had no _______ of ever enjoying any body of water. Even walking around the edge of a pool was unsettling. I _______my fear in order to save face, and few people _______ I feared water.When the water reached my chest, Lori could tell I had reached my limit. I had _______my first ever swimming lesson. I breathed a sigh如图，平行四边形ABCD绕点A逆时针旋转30°，得到平行四边形AB′C′D′（点B′与点B是对应点，点C′与点C是对应点，点D′与点D是对应点），点B′恰好落在BC边上，则∠C=