1、电子守恒规律
还原剂失电子总数(或物质的量)=氧化剂得电子总数(或物质的量)
作用：有关氧化还原反应的计算
配平氧化还原反应方程式
[思考与交流]
第二节：写作(满分30分)
假设你是新华中学的学生张华，班里从外地转来一名同学李明，他一时无法融入到新的班集体中，感到很苦恼。请根据下列要点用英语(Q吧)给他写封信。
1．帮他分析原因；
2．给他提出建议；
3．陈述你帮助他的具体打算。
注意：词数120-150
Dear Li Ming,
第二节：完形填空(共20小题；每小题1分，满分20分)
A boy selling magazines walked up to a house people seldom visited．The house was old and the owner 36 came out．When he did come out he wouldn't say hello to anybody 37 simply stared at them．
The boy knocked on the door and __38__．As he was ready to 39 away, the door slowly opened．"What do you want?" the old man said．
"Uh, sir, I'm selling these magazines and I was 40 if you'd like to buy one．" The old man 41 stared at the boy．The boy could see the inside of the house and 42 some dog figurines(小雕像)．"Do you 43 dogs?" the boy asked．"Yes, I do．They're my family here and they're all I have．" The boy felt sorry for the man, as he seemed to be very 44 ．"I've a magazine here for collectors．It's perfect for you．I also have one about dogs since you like dogs so much．" But the old man said, "I need 45 of the magazines, now goodbye．"
The boy was sad．He went home and then an idea 46 to him．．He had a little dog figurine．He walked back to the old man's house with the 47 ．He knocked on the door again and this time the old man came right to the door．"Boy, I 48 I told you no magazines．"
"No, sir．I know that．I wanted to bring you a 49 ．" The boy handed him the figurine and the old man's face 50 ．"It's a Golden Retriever．I have one at home．
This one is 51 you．" The old man was 52 ; no one had ever shown him so much 53 ? "Boy, you have a big 54 ．Thank you!" From that day on the old man 55 coming ont of the house and talking with people．
36．A．regularly B．never C．hardly D．．nearly
37．A．but B．when C．as D．so
38．A．hurried B．remained C．waited D．left
39．A．drive B．run C．escape D．walk
40．A．wondering B．saying C．doubting D．hoping
41．A．ever ' B．yet C．still D．just
42．A．loved B．noticed C．contacted D．sensed
43．A．help B．raise C．collect D．like ．
44．A．lonely B．cruel C．old D．terrible
45．A．nothing B．none C．either D．some
46．A．happened B．reached C．brought D．occurred
47．A, fear B．magazine C．figurine D．idea
48．A, imagined B．thought C．wished D．expected
49．A．friend B．dog C．gift D．book
50．A．went up B．turned up C．grew up D．lit up
51．A, with B．for C．on D．in
52．A．surprised B．calm C．disappointed D．encouraged
53．A．pity B．kindness C．politeness D．happiness
54．A．hand B．eye C．heart D．head
55．A．continued B．started C．avoided D．risked
35．-Sorry, I made a mistake again．
-_____．Practice more and you'’ll succeed．
A．Never mind B．Certainly not
C．Not at all D．Don't mention it
34．Would it be _____ for you to pick me up at four o'clock and take me to the airport?
A．free B．vacant C．handy D．convenient