停球技术的原理主要包括缓冲、切挡和变向。

世界上第一个发现细菌存在的科学家是（　　）

A．列文•虎克

B．巴斯德

C．弗莱明

D．达尔文

两个电容串联，C1容抗为5Ω，C2容抗为Ω，则（）。

A.总容抗小于10Ω

B.总电容小于10Ω

C.C1电容量较C2电容量大

D.容抗与频率无关

会计实务操作能力包括（　　）。

A．专业操作能力和专业胜任能力　

B．专业操作能力和职业技能能力

C．专业操作能力和操作的创新能力

D．专业胜任能力和专业创新能力

现向含6 mol KI的硫酸溶液中逐滴加入KBrO₃溶液，整个过程中含碘物质的物质的量与所加入KBrO₃的物质的量的关系如图所示。已知

①BrO₃^－+6I^一+6H⁺=3I₂+Br^－+3H₂O；

②2BrO₃^－ +I₂ = 2IO₃^－ + Br₂；

请回答下列问题：

（1）b点时，KI反应完全，则消耗的氧化剂与还原剂物质的量之比为            ，还原产物是            。

（2）b→c过程中只有一种元素的化合价发生变化，写出该过程的离子反应方程式                         。

（3）由反应②有同学由此得出氧化性：I₂＞Br₂的结论，你认为是否正确，并说明理由

                                            。

（4）含6 mol KI的硫酸溶液所能消耗n(KBrO₃)的最大值

为          。

（5）加碘食盐中含有碘酸钾(KIO₃)，现以电解法制备碘酸钾，实验装置如图所示。先将一定量的碘溶于过量氢氧化钾溶液，发生反应：3I₂+6KOH=5KI+KIO₃+3H₂O，将该溶液加入阳极区，另将氢氧化钾溶液加入阴极区，开始电解。阳极的电极反应式为              ；阴极观察到的现象是                           ；

阅读理解。

     Secondhand smoke isn't just a health threat to people. It can also hurt dogs and cats,veterinarians

say.

     According to the Centers for Disease Control and Prevention,more than 126 million Americans

who don't smoke are exposed to secondhand smoke in their homes,vehicles,workplaces,and public

places. This exposure causes thousands of lung cancer and heart disease deaths among nonsmokers

every year,according to the California Environmental Protection Agency.

     "Making the leap from the effects of secondhand smoke on humans to their effects on pets isn't a

big one," says veterinarian (兽医专家) Carolynn MacAllister of Oklahoma State University.

     "There have been a number of scientific papers recently that have reported the significant health

threat secondhand smoke poses to pets," MacAllister said. "Secondhand smoke has been associated

with oral cancer and lymphoma in cats,lung and nasal cancer in dogs,as well as lung cancer in birds."

     Studies have also shown that dogs living in a smoking household are susceptible to cancers of the

nose and sinus area,particularly if they are a long-nosed breed,because their noses have a greater

surface area that is exposed to carcinogens and a greater area for them to accumulate. Dogs affected

with nasal cancer normally don't survive for more than one year.

     "Short and medium-nosed dogs are more susceptible to lung cancer,because their shorter nasal

passage aren't as effective at accumulating the inhaled secondhand smoke carcinogens," MacAllister

said. "This results in more carcinogens (致癌物质) reaching the lungs."

     Birds are also at risk for lung cancer,as well as pneumonia,because their respiratory systems are

hypersensitive to any type of air pollutant.

     To help prevent animals from being adversely affected by smoking,pet owners who smoke should

have a designated smoking area that is separated from the home or stop smoking altogether,MacAllister

said.          

1. From the passage,we can see secondhand smoke maybe not harmful to _______.

A. smokers        

B. non-smokers    

C. pets        

D. trees

2. What can be suggested according to the passage?

A. Smokers can smoke anywhere.

B. Smokers can smoke at any time.

C. Smokers should smoke in the designated place.

D. Smokers must give up smoking at once.

3. What kind of dogs are likely to suffer from nasal cancer?

A. Long-nosed dogs              

B. Short-nosed dogs

C. Medium-nosed dogs            

D. Dogs without noses

4. The best title of the passage is __________.

A. Secondhand Smoke Causes Cancer in People

B. Secondhand Smoke Causes Cancer in Birds

C. Secondhand Smoke Causes Cancer in Pets

D. Secondhand Smoke Causes Cancer in Cats

5. What is the meaning of the underlined phrase "are susceptible to"?

A. are likely to be harmed by

B. are hard to be influenced by

C. are less to be effected by

D. are lucky to be caught by