选词填空

a. from France reached Canada in 1534.

b. They have themselves in their new house.

c. In the early days of the of Australia, some unwisely introduced the European rabbit.

将装满下列气体试管倒立水槽中，一段时间后观察，最终的实验现象与图相符的是（   ）

在常温下向盛满水并倒置于水槽中的试管里先后通入4mL NO₂、4 mL NO、5mL O₂ ， 经过一段时间后，试管里剩余的气体有（   ）

在△ABC中，若b，a，c成等差数列，且sin²A=sinBsinC，则△ABC的形状为（   ）

¹⁶O的质量数常被当做氧元素近似相对原子质量，“近似”不包括的含义是（   ）

Some social app companies were to blame because they didn't keep youngsters staying up late.

硫有多种含氧酸，亚硫酸（H₂SO₃）、硫酸（H₂SO₄）、焦硫酸（H₂SO₄、SO₃）、硫代硫酸（H₂S₂O₃）等等，其中硫酸最为重要，在工业上有广泛的应用．在实验室，浓硫酸是常用的干燥剂．

完成下列计算：

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。

删除：把多余的词用斜线(\)划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意:1）每处错误及其修改均仅限一词;

2）只允许修改10处,多者(从第11处起)不计分。

    Keeping a diary in English is the effective way to improve our English writing ability.

    First, it takes little time to finish a diary than other writing. By keeping English diaries, we can easy form the habit of thinking about in English.

    Second, we can practice use English idioms and useful structures in our diary-writing. If we have difficulty finding suitable words or phrases to express our opinion, we can turn in English dictionaries or teacher for help. This is also a kind of learning. If we can keep on doing this, we would gradually learn how express ourselves in English freely.

    In a word, it was of great benefit to keep diaries in English.

Feathers fall to the ground slowly, ________ stones fall much faster.

—Is your sick sister still weak?

—Yes, she doesn't even have enough to walk upstairs.

It is said that pandas ______ in our country year by year.

You should be more careful when you are driving, you might have an accident.

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    Recently some American scientists have given a useful piece of advice to people in industrialized nations．They say people should eat more of the same kind of food eaten by humans living more than 10,000 years ago．

    The scientists say that the human life has changed greatly．Our bodies have not been able to deal with these changes in lifestyle and this had led to new kinds of sicknesses．So they are called "diseases of civilization"．Many cancers and diseases of the blood system are examples of such diseases.

    Scientists noted that people in both the Old Stone Age and the New Stone Age enjoyed very little alcohol or tobacco, probably none． However, a change in food is one of the main differences between life in ancient times and that of today.

 Stone Age people hunted wild animals for their meat, which had much less fat than domestic ones．They ate a lot of fresh wild vegetables and fruits．They did not have milk or any other dairy products, and they made very little use of grains． We eat six times more salt than our ancestors．We eat more sugar．We eat twice as much fat but only one third as much protein and much less vitamin C.

     But scientists say that we would be much healthier if we eat much the same way the ancient people did, cutting the amount of fatty, salty and sweet food.

 A．Modern people used to suffer from "diseases of civilization".

 B．People today probably don't want to live like our ancestors.

 C．These new sicknesses were not known in ancient times.

 D．Ancient people also got lots of physical exercise.

 E．In that case, they would live much healthier.

 F．But today, we enjoy eating a lot of these.

 G．Stone Age people lived a simple life.

现有200mL盐酸与硫酸的混合溶液，其中H⁺浓度为2.5mol•L^﹣1 ， 向溶液中逐滴加入Ba（OH）₂溶液200mL时，恰好沉淀完全，得到沉淀4.66g．

Once you find a fire,(尽快拨打119).

现有100g过氧化氢溶液，测得其中含氢元素的质量分数为8％，加入8gCuSO₄作催化剂 制取氧气，充分反应后所得溶液（无晶体析出）中溶质的质量分数为（   ）  

阅读理解

    English Teacher Needed

    We are one of the biggest English teacher agencies in China; we prefer lots of foreign teachers/employees to universities or companies daily. We provide this service for teachers for free.

    What you need to do is log on our website www. languageteaching. com. cn and register. We will put your resume (简历) on the website except contact details. There are thousands of potential clients who will view your information daily. Once they choose you we will contact you. For more details you can also send an email to admin @languageteaching. com. cn.

    Part-time English Tutor Wanted

    We are looking for a part-time English teacher, and the teacher should come from the USA, Canada, the UK, New Zealand or Australia. We would like to have 2 lessons a week, 2 hours each lesson.

    Please send me your resume with a photo if you are interested. Email：admin@languageteaching. com. cn.

    Private English Tutor Wanted

    A senior Chinese manager is looking for a one-to-one English tutor for several hours per week. He would like to learn British pronunciation, so UK natives will be preferred. The tutor should be fairly flexible (灵活的) to suit his busy schedule and be of professional appearance. The pay is to be discussed directly and will be very high for the right candidate. Teaching experience is not a must.

    If you are interested, please send an email with your background information, pay expectations and a recent picture to dhanyatk@hotmail. com.

    CALLING—Teacher/Librarian!

    We are a small kindergarten attached to an international school in Beijing. We need a teacher/librarian. The teacher we are looking for will be a Chinese and English speaking librarian.

    Qualifications：

    Be self-starters, active team players.

    Have a positive attitude and love to work with kids.

    Be able to provide an exciting and innovative library program for students.

    If you meet the above qualifications, please send your resume and a current picture to principalinchina @yahoo. com.

若 的三内角分别为 ，满足 ，则 的形状为（    ）

My family think they know a lot about me but I turn out to be a little different from_______ they think.

取质量为27.4g的Na₂CO₃和NaHCO₃的固体混合物，与200mL 2.00mol·L^-1的盐酸恰好完全反应不再放出气体。