解吸剂再生塔底中的重组分完全是系统中自有的。（）

阅读理解。

     Many cultures have different ideas about why people catch colds. For

example, in the United States, some people think that you can catch a cold if

your feet get cold. So mothers tell small children to wear warm boots in the winter. In other places, including parts of the Middle East, some people

believe that strong winds cause colds. So, on trains and buses, people usually don’t like to sit next to open windows. In parts of Europe, some people

think that wearing wet clothes will give you a cold. They say that after you go swimming, you should quickly put on dry clothes. Today, scientists know

that colds are caused by a virus (病毒). But the old ideas are still very strong, and many people still follow them to avoid (避免) getting ill.        

1. In the United States, people think you can catch a cold if ______________________.

A. you wear wet clothes

B. you sit next to the windows

C. your feet get cold

D. you go swimming in summer

2. Which is NOT a cause(成因)of colds in the reading?

A. bad food

B. wet clothes    

C. a virus

D. strong winds

3. In“people still follow them to avoid getting ill”, what does “them” mean ?

A. scientists    

B. old ideas    

C. colds

D. dry clothes

4. What is the main (主要的) idea of this reading?

A. You should take good care of your health in winter.

B. Colds are the biggest health problem in the world.

C. Some people think that strong winds cause colds.

D. People still believe old ideas about why they catch colds.

抽汲工具进入防喷管后，立即关闭清蜡闸门。

测定某一废水的总氰化物（如焦化厂洗气水），水质色度深且含有大量硫货物、焦油、甲醛、苯系物和挥发酚（<100mg/L），为保证分结果的准确，应如何去除这些干扰物质？

口腔预防医学的二级预防又称为（）

A.人群

B.消除致病因素

C.临床前期预防

D.病因预防

E.临床预防

为加强旅游安全管理，县级以上人民政府及其有关部门应当对旅游目的地的（）等危及和可能危及旅游者人身、财产安全的事件进行检测、分析和评估。

A．自然灾害

B．事故灾难

C．公共卫生事件

D．社会安全事件