如图两幅图片反应的历史事件是中国解放决历史遗留问题的成功范例。这两地回归祖国的时间分别是（    ）

高纯硅是信息产业最基础的原材料，制备高纯硅的主要生产过程如下：

请回答：

（1）一个SiHCl₃分子中含有氯原子的个数为　    　。

（2）制备高纯硅的反应原理：SiHCl₃（纯）+H₂Si+3X，则X的化学式为　   　。

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   ①The meaning of shaking the head is not always the same in different countries. Maybe some visitors would be surprised when they first came to India. When talking to an Indian, he would often shake his head. The visitors might think that the Indian did not like what they said. But, in fact, they would be completely(完全地)wrong.

   Indians always shake their heads when they talk to each other. It does not have the same meaning as“No”. If someone wants  ②  (visit)India, he should know this, or it will give him some trouble.

   One day, a foreign officer went to  ③  on business. He leased(租用)a car and hired(雇用)an Indian to drive it. When he told his driver to send him to his office, the Indian shook his head at once. The officer said again, and the driver shook his head again. At last, the officer, of course, got angry.

   “Why do you refuse(拒绝)my order(要求)? ”he shouted. “Drive me to my office at once! ”

   The driver answered in a quite loud voice, too. “Yes, sir! ”But to the officer’s surprise, the driver shook his head at the same time.

The car started, and the foreign officer was now too surprised to say a word. He thought about it for a while, and then ④he nodded with a smile, “‘No’ means ‘Yes’ here! ”

____ ____three quilts．

 随着生活水平的提高，人们越来越关注自身的健康。请你参与下列关于化学物质与人体健康问题的讨论。