15．Determining the relative strengths of oxidizing and reducing agents.

I hear many parents complaining that their teenage children are rebelling. I wish it were so. At young age you ought to be growing away from you parents. You should be learning to stand on your own two feet. But take a good look at the present rebellion. It seems that teenagers are a1l taking the same way of snowing that they disagree with their parents. Instead of striking out on their own，most of them are clutching at one another’s hands for reassurance.

They say they want to dress as they please，but all of them wear the same clothes. They set off in new directions in music，but all of them end up huddled round listening to the same record. Their reason for thinking or acting in this and that way is that the crowd is doing it.

It has become harder and harder for a teenager to stand up against the popularity wave and go his or her own way. These days every teenager can 1earn from the advertisements what a teenager should have and be. And many of today’s parents have come to award high marks for the popularity of their children.

All this adds up to a great barrier for the teenager who wants to find his or her own path. But the barrier is worth climbing over. The path is worth following. You may want to listen to classical music instead of going to a party. You may want to collect rocks when everyone else is collecting records.

You may have some thoughts that you don’t care to share at once with your classmates. Well，go to it. Find yourself. Be yourself. Popularity will come-will the people who respect you for who you are. That’s the only kind of popularity that really counts.

The author’s purpose in writing this passage is to tell _____.

A.readers how to be popular with people around

B.teenagers how to learn to decide things for themselves

C.parents how to control and guide their children

D.people how to understand and respect each other

According to the author, many teenagers think they are brave enough to act on their own, but, in fact, most of them _____.A.have much difficulty understanding each other

B.lack confidence

C.dare not cope with problems single-handed

D.are very much afraid of getting lost

Which of the following is NOT true according to the passage ？A.There is no popularity that really counts.

B.What many parents are doing is in fact hindering their children from finding their own paths.

C.It is not necessarily bad for a teenager to disagree with his or her classmates.

D.Most teenagers claim that they want to do what they like to, but they are actually doing the same.

The author thinks of advertisements as _____.A.convincing

B.influential

C.instructive

D.authoritative

During the teenage years, one should learn to _____.A.differ from others in as many ways as possible

B.get into the right season and become popular

C.find one’s real self

D.rebel against parents and the popularity wave

请帮忙给出每个问题的正确答案和分析，谢谢！

2H⁺(aq)+2e→H₂(g)

Zn(s)→Zn²⁺(aq)+2e

11．对于反应 Ag⁺(aq)+Fe²⁺(aq)→Ag(s)+Fe³⁺(aq)

9．现有下列原电池Pb|Pb²⁺(1mol·dm^-3)||Cu²⁺(1mol·dm^-3)|Cu

6．由标准氢电极和镍电极组成原电池。若c(Ni²⁺)=0.010mol·dm^-3时，电池的电动势为0.309V，其中镍为负极，计算镍电极的标准电极电势。

(A) 化学腐蚀  (B) 吸氧腐蚀

(C) 析氢腐蚀  (D) 阳极产生CO₂的腐蚀