前进中学初二（8）班收集到某个家庭中的一些遗传信息如下：

Dear tim,
I remember you told me you were interested in teaching in China. Qianjing middle school now is looking for a English teacher. If you come, you can teaching two classes a semester of English spoken, responsible for 10 lessons per week extra-curricular activities in schools in English once a week.Please let me know if you are interested and if you have any other questions, I’d be more than happy to help.
Please write soons to me a bout yours,I'mlooking for ward to your letter.
Best wishes,
lihua

Hi Tom, This is Li Hua, How is going? I heard that you expect to be a teacher in China, and I got some good news for you. Qianjin secondary school has a position for English teacher, and I am going to show you some details of this work. This job will cover one semester, you take charge of 2 classes' English teaching work, and there are 10 lectures involved weekly in your timetable. What's more, you are responsible for English extracurricular activities once a week as well. Your salary will be 4,000 yuan per month, and your travelling costs will be supplied by the school, and there is not any accommodation fee during this period of time. If you are interested in this work, don't hesitate to email me. Best regards Li Hua

（1）相对性状
（2）变异
（3）AA 或Aa
（4）25%

Dear Tim,
I heard you want to be an English teacher in a middle school. I want to mention some things about your job.Frist,your work time is one term.And you need to teach English spoken in two classes,once time a week.What's more,you should be responsible for the English extracurricular activity,once time a week too.As for your treatments,your salary is 4000RMB every moth.Besides,the school will offer you the plying tickets and free lodging.
All the best,
Li Hua
希望帮到你,如果有不懂可以找我.
问题补充：
中翻：亲爱的TIM,
我听说你想在中学做一位英语老师.我想说明一下关于你的工作.首先你的工作时间为一学期,你需要教两个班的口语、每周一次.而且,你要负责学校的英语课外活动.每周一次.至于你的待遇,你的工资每月4000元.另外,学校会向你提供往返机票,免费住宿.
祝一切都好.
李华.

初四.

Qianjin Middle School needs a lesson on a semester English speaking teacher, taught two classes of oral, ten lessons per week, responsible for school extra-curricular activities in English once a week
不知道对不？

（1）前进中学七年级（3）班共有16+8+24=48名学生；（2）根据条形图可知：乘车的人数是16人，在扇形图中占总人数的 =33%；步行的人数是8人，在扇形图中占总人数的 =17%；骑车的人数是24人，在扇形图中占总人数...

解题思路：（1）分析数据可知，第三份混合物的溶液跟25g未知质量分数的氯化钡溶液恰好完成反应，所以第一、二份中BaCl₂被反应完，而Na₂SO₄有剩余．且得到硫酸钡沉淀的质量为2.33g；
（2）由2.33g沉淀的质量，根据氯化钡与硫酸钠反应的化学方程式就可以计算出本题答案．

（1）由题意知，当沉淀的质量不再增加时，说明，硫酸钠已经完全反应．然而在第一、二份中，假如再加入氯化钡沉淀继续增加，说明第一、二份中BaCl₂被反应完，而Na₂SO₄有剩余；
（2）设：混合物中硫酸钠的质量为x．
Na₂SO₄+BaCl₂=BaSO₄↓+2NaCl
142 233
x 2.33g
[142/x＝
233
2.33g]
x=1.42g
原混合物中硫酸钠的质量分数为[1.42g/5g]×100%=28.4%
故答案为：（1）一、二；（2）28.4%

点评：
本题考点： 根据化学反应方程式的计算；有关溶质质量分数的简单计算；盐的化学性质．

考点点评： 本题主要考查含杂质物质的化学方程式计算和质量分数的计算，难度较大．计算时要注意：第三份混合物溶液与25g氯化钡溶液恰好完全反应，应以本组数据进行计算．

Dear Tim,I know you want to come to China and teach chinese students English.Now,Qian Jin Middle School need an Englishi teacher. You will stay here for a term if you come.And you will teach two class...

dear Tim：
I once hear you want to china teach Enalish. there is a work now. work time is a year.teacher two class Enalish and ten everyday.

Dear Tim:
Hi, Tim. I'm Li Hua. How are you?
I found a good way to help you. The Qianjin middle school needs an English teacher. The working time is a semester. You need to teach two class of English, ten English classes a week. And you need to be responsible for the English extracurricular activity as well, once a week. The compensated is well, 4000 yuan a month, your round-trip air ticket and accommodations will be subsidized.
What do you think of this work? I hope you'll come to China soon!
Yours,
Li Hua
楼楼很认真写的!望采纳啊望采纳!

（1）由题意知，当沉淀的质量不再增加时，说明，硫酸钠已经完全反应．然而在第一、二份中，假如再加入氯化钡沉淀继续增加，说明第一、二份中BaCl₂被反应完，而Na₂SO₄有剩余；
（2）设：混合物中硫酸钠的质量为x．
Na₂SO₄+BaCl₂=BaSO₄↓+2NaCl
142 233
x 2.33g

142
x＝
233
2.33g
x=1.42g
原混合物中硫酸钠的质量分数为
1.42g
5g×100%=28.4%
故答案为：（1）一、二；（2）28.4%

0000

My friend Time had always wanted to come to China and teach English here. Lately, I heard about that there is an English teacher wanted for Qian-Jin Middle School (Qian-Jin Junior High School), can you please write a letter to him about the situation?
So mainly, this job lasts for one semester, he will be teaching at least 100 words to two Speaking classes English, with ten classes and one field trip each week. As to the salary, there will be ￥4000 Chinese Yuan (RMB) per month, cost-free shelter, and two way airplane tickets provided.

My name is Lihua.Dong is my penpal and he always hope to teach english in china.When I heard that Qianjin Middle School need an english teacher,I wrote to Dong and told him about the work position.
The work lasts one semester ,teach 2 classes oral english lessons,10 classes per week.
Salary is 4,000 per month.Free accommodation and round-trip tickets are also offered additionally.

Dear Tim,
I write to inform you that QianJin Middle school hires an English teacher recently.He who takes 10 lessons of 2 classes for one week has to sign one contract for one semester. They offer 4000RMB/month,round-trip ticket and free accommodation.I think you are the right man.
R.S.V.P
Sincerely yours,

Dear Tom
I am very happy to hear from you. Welcome to chinese teaching english.
Recently, I heard from my friends that the Qian Jin Middle School need an english teacher.I asked him for the specific circumstances. He told me the relevant information. If you came to do, your needed to teach a term. What's more, you need to teach the spoke english of two classes. Ten classes a week and responsible for the school english extracurricular activities weekly. He also told me that they can give you a monthly payment of 4000 yuan includes Round-trip ticket and free accommodation.
Looking forward to seeing you.
Yours,
Li hua

aiciba

Dear Tim,QianJin Middle School needs a English teacher, taught two classes of English extra-curricular activities, extra-curricular activities to teach English in schools once a week,

Dear Tim, How are you?How are you getting along with your work?I am very gald to hear from you.You have said that you hope to teach English in China.Now I get a piece of news that the Qian Jin Middle School needs an English,I think you can do the job so I write to you.The school has an English teacher who can teach oral English for two classes one term,and there are ten lessons a week,and take charge of the English activities outside of the English class once a week.If you get the job,you can earn 4000 yuan every month,and the school provides the plane tickets for your coming and returning,and free living confitions.Hope you come to China soon! Best wishes! yours Li Hua
麻烦采纳,谢谢!

In English
My name is LiHua .I have a pen pal ,he name is Tim
,he always wants to teach English in China and he knows Advance Middle School needs a English teache