氯气用途十分广泛，可用于生产半导体材料硅，其生产的流程如下，下列说法不正确的是（   ）石英砂 $\underset{高温}{\overset{①焦炭}{\to }}$ 粗硅 $\underset{加热}{\overset{②氯气}{\to }}$ 四氯化硅 $\underset{高温}{\overset{③氢气}{\to }}$ 纯硅．

阅读下面短文。从每题所给的A、B、C、D四个选项中，选出正确选项。

B

    Are you sorry for not traveling during the National Day? If you stay a t home at that time, I think you are very lucky. Why? Because there are too many people everywhere. In many places of interest in China, it's too crowded to do anything.

    It was very crowded in the West Lake on October 1st, 2013. You even couldn't take photos for you or your friends. All what we could see were people. It was reported that there were about 13 people per meter by the lake. My friends told me they could see nothing but many tourists(游客) on the Broken Bridge(断桥). "We couldn't walk if the people in front of us didn't walk," he said. He showed us a photo near the West Lake. In the photo, we hardly found him out, there were too many people.

    So some people give the advice that we should not have the gold week(黄金周) any more. But other people say no about this advice. What's your idea of it? Are you sorry now for not traveling during the gold week? I love staying at home more than traveling next National Day.

由中科院院士、长春应化所汪尔康研究员和第三世界科学院院士董绍俊研究员等承担的国家自然科学基金重点基金项目“模拟生物膜体系的生物电化学研究”，日前在北京通过了国家基金委化学部组织的专家验收，该项研究已取得了一批具有重要学术影响的成果，对生物电化学、生物传感器、纳米技术等领域具有重要的指导意义。下列有关叙述中正确的是                         （　　）

俗话说红梅报春，小梅同学特别喜欢梅花，他发现梅花还没长叶就先萌发了，于是思考：花芽的萌发是否也和种子的萌发一样不需要光呢？小梅设计了一个实验对其进行探究，具体操作如下：

①在腊月准备两盆生长状态相似的梅花，选择其中一盆覆盖黑塑料袋儿，一盆而不覆盖黑塑料袋儿．两盆梅花都放置在阳台上．

②定期给两盆梅花浇同样多的水，观察现象．

③春节前后，两盆梅花同时绽放出许多花蕾，并陆续开了花．

请根据上述实验回答下列问题．

阅读下面的文言语段，完成题目。 
         孙叔敖^①为婴儿之时，出游，见两头蛇，杀而埋之。归而泣，其母问其故，叔敖对曰：“闻见两头之蛇者死。向者吾见之，恐去母而死也。”其母曰：“蛇今安在？” 曰：“恐他人又见，杀而埋之矣。”其母曰：“吾闻有阴德者天报以福^②，汝不死也。”及长，为楚令尹，未治而国人信其仁^③也。                                                                                                                                                                  (选自《新序杂事一》)
【注】①孙叔敖：春秋时楚国人。楚庄王时为楚令尹。②有阴德者天报以福：积有阴德的人，上天就会降福于他。③仁：仁慈。