第20题: [单项选择]当光照增强时,瞳孔缩小,此反射称为 A. 瞳孔近反射 B. 直接缩小反射 C. 瞳孔对光反射 D. 角膜反射 参考答案:C 答案解析:[考点] 瞳孔对光反射 [解析] 瞳孔大小随光照强度而变化的反应,是一种神经反射,称为瞳孔对光反射。在亮光处缩小,在暗光处散大。
第21题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. They can’t afford to buy a video-recorder. B. They can’t afford to buy a new camera. C. They can afford to buy another video-recorder. D. They can afford to buy a new camera. 参考答案:B 答案解析:[听力原文]
W: We should take our camera while touring Florida.
M: It can’t work properly. If you had n