问题 选择题

如图是一个盐桥中充满饱和KCl溶液的锌铜原电池装置,下列分析正确的是

A.Cu片上发生氧化反应

B.电子由Cu片经外电路流向Zn片

C.盐桥中的Cl移向ZnSO4溶液

D.一段时间后烧杯中c(Zn2+)、c(Cu2+)均减小

答案

答案:C

题目分析:装置中,形成原电池,锌为活泼金属,被氧化而失去电子,铜为原电池正极,正极上得电子而被还原,原电池中,电子由负极经外电路流向正极,电解质溶液中,阳离子向正极移动,阴离子向负极移动。A、铜为原电池正极,被还原,故A错误;B、原电池中电子由负极经外电路流向正极,故B错误;电解质溶液中阴离子向负极移动,故C正确;D、原电池,锌为活泼金属,被氧化而失去电子,铜为原电池正极,正极上得电子而被还原成铜离子,使溶液中锌离子浓度升高,铜离子浓度降低,故D错误。

阅读理解

“I didn’t hear them call my name,” explained Shelley Hennig to Active Teens (AT) as she talked about that exciting moment on national television when she won the honor of Miss Teen USA 2013. “Are you ready?” is what she heard. Then she said, “I shook my head no, and then they said ‘yes’ and it was announced again."

It was four days after that life changing moment for the seventeen-year-old high school student from Destrehan, Louisiana—she was still on cloud nine.

“I was so shocked! I never believed that it could actually really happen.” Present in the audience(观众)that day were: her mother and father, older brother, her friends, and her dance teacher.

Understanding why members of her family and her friends would be there, AT asked why her dance teacher had traveled so far to see her compete. “She’s always been my role model. I’ve danced with her since I was six. She’s been through so many difficulties and came through them all. I’ve learned to get over bad life’s experiences and learned how to move on because of her.”

One of those bad life’s experiences for Shelley happened three years ago when her brother Brad was killed in a drunk driving accident. He was 18. She found writing helped her get through the rough days. She said, “I write a lot about my brother. I write a lot, a lot, a lot...”

As Miss Louisiana Teen, she traveled around the state speaking to teens about the dangers of drinking and driving. In her role as Miss Teen USA, Shelley will continue to speak to youth about safe driving, in addition to many other things to help the youth.

When AT asked Miss Teen USA if she had any advice for our readers, she said, “Don’t let anyone change you. Hang out with people that make you feel good about yourself. That way, it is easy to be yourself.

小题1:The underlined words “on cloud nine” in Paragraph 2 can be replaced by ________.

A.frightened

B.troubled

C.very happy

D.very angry小题2:Shelley takes her dance teacher as a role model mainly because she is _______.

A.determined

B.friendly

C.strict

D.experienced小题3:What did Shelley often do after she became Miss Louisiana Teen?

A.She visited drunken drivers.

B.She gave dance performance.

C.She made speeches on safe driving.

D.She helped other teens with their studies.小题4:What suggestion does Shelley give to the teens?

A.Be yourself with the support of friends.

B.Meet friends whenever possible.

C.Go easy on yourself and others.

D.Have a good role model.

单项选择题