单项选择题 细动脉硬化性固缩肾时，肾皮质变薄，肾盂周围脂肪变性。（ ）

单项选择题 In this section, you will hear three passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D).A、Only five percent of the shoppers decide in the store. B、More than five shoppers make a list before shopping. C、Nearly ten percent of the shoppers decide in the store. D、Less than twenty percent of the shoppers make a complete list.

单项选择题 下列哪种功能，能让长达5分钟的视频，在本页PPT只播放其中的一小段呢？