A. They listen to the sound of the ball bouncing. B. They ask an adult to guide them. C. They hold a bell in their hands. D. They put a bell inside the ball.
参考答案:D 答案解析:文章第一段指出teams of blind children can enjoy fast-moving games of soccer with a bell inside the ball....
第12题: [多项选择]可使咽鼓管咽口开放的肌肉是()。 A. 鼓膜张肌 B. 腭帆张肌 C. 镫骨肌 D. 腭帆提肌 E. 咽鼓管咽肌 参考答案:B, D, E 答案解析:咽鼓管处于静止状态时软骨部闭合成一裂隙。腭帆张肌、腭帆提肌、咽鼓管咽肌起于软骨壁或结缔组织膜部,前两肌止于软腭,后者止于咽后壁,故当张口、吞咽、哈欠时借助上述三肌的收缩,可使咽口开放。