硫酸是极其重要的化工原料，在工业、农业、医药、军事等领域应用广泛。工业上通常用接触法制硫酸，主要原料是硫铁矿和空气。接触法制硫酸的生产过程大致可 分为三个阶段：二氧化硫的制取和净化；二氧化硫转化为三氧化硫；三氧化硫的吸收和硫酸的生成。为了防止环境污染并对尾气进行综合利用，硫酸厂常用氨水吸收尾气的 SO₂、SO₃ 等气体，再向吸收液中加入浓硫酸，以制取高浓度的 SO2 及(NH₄)₂SO₄和NH₄HSO₄固体。为了测定测定上述(NH₄)₂SO₄和NH₄HSO₄固体混合物的组成，现称取该样品四份，分别 加入相同浓度的 NaOH 溶液 50.00 mL，加热至 120℃左右，使氨气全部逸出［(NH₄)₂SO₄和NH₄HSO₄的分解温度均高于 200℃］，测得有关实验数据如下（标准状况）：

为了测定铁铜合金的组成，将7.6g铁、铜合金加入100mL某浓度的稀硝酸中，待合金完全溶解后，共收集到NO气体2.24L（标准状况下），并测得溶液中H⁺的浓度为0.5mol•L^﹣1 ． 若反应前后溶液的体积变化忽略不计，则下列判断正确的是（    ）

阅读理解

Will you be playing some music at work?

    Music is particularly popular in the medical profession, especially among surgeons（外科医生）. A recent survey shows that 90% of surgeons in the UK put music on the sound system in the theatre during operations. Plastic surgeons（整形外科医生）play the most music; it appears that ear, nose, and throat specialists the least.

    But it isn't only in surgeries(外科手术) where music is popular. In another recent survey, one-third of the 1,613 people said they listen to music while working. And 79% of them said that humming（哼歌）along improves their job satisfaction or productivity.

    Is listening to music at work a good idea? Yes, say the experts. Many surgeons say that music helps to create a “calm atmosphere”, and a third of them added that it avoids getting bored! Also, listening to music raises the levels of a brain chemical that can help people focus. Office workers say it improves job satisfaction. Several studies suggest that it's also good for hospital patients. Those listening to music through headphones during surgery require less anesthetic（麻醉剂）, up to 50% less in some cases, and recover more quickly afterwards. “Sure, music reduces anxiety before surgery,” says Zeev Kain, an anesthetist at Yale University.

    So, what type of music should we be listening to? Surgeons from the previous survey preferred rock, pop music and classical. And hip-hop is popular too. However, whatever the kind, it appears that self-selected music is the best choice. Pennsylvania State University research showed that when people chose their own music there was more stress reduction(下降). And other researchers found that when listening to self-selected music, surgeons did the maths faster and more accurately than when they were listening to music chosen for them.

下列反应中，反应后固体质量减轻的是（　　）

①氨气通过灼热的CuO粉末

②二氧化碳通过Na₂O₂粉末

③水蒸气通过灼热的Fe粉

④Zn投入CuSO₄溶液．

在 中， ， ， ，则 为（    ）

2020年10月，我国将实施嫦娥五号登月计划，实现月面无人采样返回。月球土壤中含有丰富的 He，则该原子中（    ）

已知某微粒的结构示意图为： （ y≠0 ）．请回答：

—John, look at the time. _____ you play the piano at such a late hour?

—Oh, sorry.

下列关于古代文化知识的说法，不正确的一项是（   ）

It may take a long time to find a s conflicts between the two countries.

短文改错，文中共有10处语言错误，每句中最多有两处。

    I am secretary of the City Student Union (CSU). We were organizing an art exhibition for high school students in city. It will be held in the 9th of July in the Exhibition Hall of Beihai. More than 1000 painting will be on show, but high school students and teachers from all the eight districts will come to the event. As you are very popularly with us Chinese high school students, we'd like to invite for you to the exhibition. We would be grateful when you could join them that day. Looking forward to hear from you soon.

语篇填空

    Our local Community Youth Club is a very popular organization with young people in my town. I (be)a member for four years now and I've taken part   a lot of interesting projects. These include fun activities such as holiday camps and discos. We have organized sports  (competition)and we have even made a video.  it isn't all just enjoyment; we have started doing social work  (help) people in our neighborhood. We have organized activities for small children during the holidays. We have also formed a special support group to help young people stop (smoke)! We are proud of the most recent group  we have founded. It organizes regular visits to the local old people's home. The old people, who were very excited by our visit, told us their (person) stories. We sang songs and played games with them and had tea together. Some of (they) were in poor health and were very unhappy. After this visit, my friends and I  (decide) that we should do something to help improve the quality of their lives.  

目前，街头出现了越来越多的猫与狗，对此你们班同学们组织了一场讨论：城市内是否可以饲养宠物。根据下表所提供的信息，介绍讨论情况，并说明自己的观点和建议。

支持饲养宠物	反对饲养宠物	你的观点
1）安慰孤寡老人 2）人与动物和谐相处，增添生活情趣	1）造成环境污染 2）吵闹声，甚至伤人	……

注意：1）词数100左右。

2）可以适当增减细节，以使行文连贯。

3）开头语已为你写好。

Recently we have had a heated discussion on whether people should keep pets at home in cities.……

含有0.30g甲醛的水溶液与过量银氨溶液充分反应，生成的银有（   ）

补写出下列句子中的空缺部分。

Over 80% of the 3.6 million people are of European origin.

Over 80% of the 3.6 million people Europe.

It's hard to imagine (live) anywhere else but here.

Elizabeth opened a hospital poor people in New York City.

化学与生活息息相关，在研究具体问题的时候会运用很多方法，其中一种就是把体积和压强的影响，转化成盒子进行研究．

I在一密闭气缸内，用不漏气的可滑动的活塞隔成两室（图1），左室充有甲烷（CH₄）和氧气的混合气体，右室充有氯气和氢气．已知当氧气足够多时甲烷完全燃烧，生成CO₂ ， 氧气不足时有CO生成，Cl₂+H₂═2HCl．在室温下，静止在气缸的“3”处（液体体积忽略不计）．

When we ________after a long talk, we found the children sleeping in _______beds.