在测定“小灯泡的电功率”的实验中，已知电源电压为6V，小灯泡的额定电压为2.5V，小灯泡的电阻约为10Ω，滑动变阻器上标有“20Ω 1A”字样．左图是小向同学没有连接完的实物电路。

（1）请你用笔画线代替导线，将实物电路连接完整；
（2）实验中，小向同学连接好电路后，闭合开关，移动滑片，发现小灯泡始终不亮，且电压表有示数，电流表无示数，则故障的原因是                             ；
（3）故障排除后，闭合开关，移动滑动变阻器的滑片到某一位置 ，电压表的示数如右图甲所示，此时电压为      V，要测量小灯泡的额定功率，应将滑片P向     端滑动（选填“左”或“右”）；
（4）当小灯泡正常发光时，电流表的示数如图乙所示，则小灯泡的额定功率是     W。

American and British people both speak English, but sometimes it doesn’t seem like the same language.

First of all, they sound very different. Often, Americans don’t say all the letters in each word, especially consonants （辅音） like “t” and “d.” For example, Americans may say “I dun no” instead of “I don’t know”. However, the British usually pronounce their consonants more carefully.

Also, some letters have different sounds. For example, Americans say the “a” in “half” like the “a” in “cat,” but the British say the “a” in “half” like the “a” in “ash.”

Sound is not the only difference between British English and American English. The two languages have different words for some things. For example, the words for clothing are different. Americans use the word “sweater,” but the British say “jumper.”

Many other words and expressions are different in the two countries. In England, if you are going to telephone a friend, you “ring her up.” In America, you “give her a call.” The British use the word “lovely” to describe something they like. Americans use the word “cool” or “great”.

There are also some differences in grammar. For example, Americans almost always use the helping verb “do” with the verb “have.” They might say “Do you have an extra pen?” The British often ask the question in a different way. They might say “Have you got an extra pen?”

These differences can be confusing（令人混淆的） if you are learning English. But there is a reason for the differences. Languages change over time. When the same language is used in different places, it changes differently in each place. This is what happened to English. It also happened to other languages, such as French. Many people in Canada speak French, but their French is different from the French spoken in France.

1．Do Americans say all the letters in each word?

___________________________________________________________

2．Who use the word “sweater”, Americans or the British?

___________________________________________________________

3．Is French the same in Canada and France?

____________________________________________________________

4．Why are there some differences in the same language?

___________________________________________________________

5．What is the main idea of the passage?

___________________________________________________________

根据短文内容和首字母提示，在下文空格处填入适当的词使短文完整。(每空一词)
Millions of words about young American people’s ideas, feelings and actions have been 【小题1】w_▲_ over the years.
Today there are about seven million Americans in colleges and universities. Young people 【小题2】u_▲_twenty-five are nearly half of American people.
Many of these will soon be in charge of (负责管理)the nation. Naturally their ideas are 【小题3】i_▲_ to everyone in the country, and it is necessary for older people to understand what they 【小题4】t _▲_ and feel.
College students today have strong opinions about 【小题5】r_▲_ and wrong. They are deeply 【小题6】i_▲_ in making a better life for all people, 【小题7】e_▲_ for those who have not been given a fair chance before now. They see much that is wrong in the 【小题8】l_▲_ of their parents. It is 【小题9】h_▲_ for them to see what is right and good in the older ways. As a result, there is often 【小题10】t_▲_ in American families.

从对话后的方框中选择适当的选项补全对话。
M: I hear there’s going to be a basketball match this Sunday. Tom and I are going to watch it. 【小题1】          
W: Of course. Basketball is my favorite, but I have no ticket to the match. What a pity!
M: You’re lucky. I have some free tickets. 【小题2】      
W: Great!  【小题3】        
M: Let’s meet at the bus stop at half past five.
W: I think there must be a big crowd of people there at that time. 【小题4】           
M: OK. See you at five o’clock.
W: See you.

A．What about making it a little earlier? B．Let’s share them together. C．Do you want to watch the match? D．When and where shall we meet?

 

Cu的化合物在生活及科研中有重要作用，不同反应可制得不同状态的Cu₂O
（1）科学研究发现纳米级的Cu₂O可作为太阳光分解水的催化剂。
①在加热条件下用液态肼（N₂H₄）还原新制Cu（OH）₂可制备纳米级Cu₂O，同时放出N₂。当收集的N₂体积为3.36L（已换算为标准状况）时，可制备纳米级Cu₂O的质量为        ；

②一定温度下，在2 L密闭容器中加入纳米级Cu₂O并通入0.20 mol水蒸气，发生反应：
  ；测得20 min时O₂的物质的量为0.0016 mol，则前20 min的反应速率v（H₂O）=                  ；该温度下，反应的平衡常数表达式K=                  ；下图表示在t₁时刻达到平衡后，只改变一个条件又达到平衡的不同时段内，H₂的浓度随时间变化的情况，则t₁时平衡的移动方向为      ，t₂时改变的条件可能为              ；若以K₁、K₂、K₃分别表示t₁时刻起改变条件的三个时间段内的平衡常数，t₃时刻没有加入或减少体系中的任何物质，则K₁、K₂、K₃的关系为                ；
（2）已知：ΔH＝－293kJ·mol^－1           
ΔH＝－221kJ·mol^－1
请写出用足量炭粉还原CuO（s）制备Cu₂O（s）的热化学方程式        ；
（3）用电解法也可制备Cu₂O。原理如右上图所示，则阳极电极反应可以表示为        。