问题 选择题

下列关于如图装置的说法正确的是(  )

A.银电极是负极

B.铜电极上发生的反应为Cu-2e-=Cu2+

C.外电路中的电子是从银电极流向铜电极

D.该装置能将电能转化为化学能

答案

A.该原电池中,铜是负极,银是正极,故A错误;

B.铜电极上铜失去电子发生氧化反应,电极反应式为Cu-2e-=Cu2+,故B正确;

C.外电路中的电子从铜电极沿导线流向银电极,故C错误;

D.该装置没有外接电源,是将化学能转变为电能的装置而不是将电能转变为化学能的装置,故D错误.

故选B.

阅读理解

Reading comprehension.

     Honestly, since my son was born, I have thought a lot about how to raise a child. I once heard a story

that told about when a baby was born. The story said that when a baby was born, a new master was born.

The parents of that baby would become the servants. The question is: Why? Based on my observation, this

phenomenon is true. Most parents who don't pay much attention to their kids have difficulties with their kids'

attitude.

     I'll make a comparison of how two families raise their children. The first one is a family with three children.

Both mother and father never say "No" to their children's demands. As a result, all of their children became

stubborn and won't listen to their parents' words, "We can't."

     The second family educated their children strictly from one year old to high school. The parents never

approved or agreed directly to give their children what they wanted. They always postponed one or two days,

even if they could afford it. Due to the way their parents educated them, these children understood that if they

wanted something, they had to wait or they had to make an effort first. As a result, all the kids from the second

family successfully graduated from university on time.

     In my opinion, if we want to be successful parents and raise our children well, we have to start disciplining

them when they are toddlers but not wait until they become teenagers.

1. Why did the writer give two different stories in this passage?[ ]

A. To help prove his opinion about raising a child.

B. To list different ways that parents may take.

C. To criticize some parents' foolish action.

D. To prove that his way of education is right.

2. What does the underlined word "postponed" in the third paragraph mean?[ ]

 A. Carried out at once.

B. Gave up.

C. Put off.

D. Made a decision.

3. In the writer's opinion, which of the following about raising a child is TRUE?[ ]

A. Children should be respected once they were born.

B. Parents should educate their children as early as possible.

C. It is right time to educate their children when they are teenagers.

D. Children should be helped whenever they make mistakes.

4. What do you think is the best title of this passage? [ ]

A. Make a comparison of how two families raise their children

B. To be successful parents

C. How to raise children well

D. Educate children strictly from one year old to high school

单项选择题