在相同状况下，一个空瓶，若装满O₂称其质量为36g，若装满CO₂称其质量为42g，若装满A气体，称其质量为52g，则A的相对分子质量是．

如图是某只含有C、H、O、N的有机物简易球棍模型．下列关于该有机物的说法正确的是（　　）

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阅读理解

    While Jennifer was at home taking an online exam for her business law class, a monitor(监控器) a few hundred miles away was watching her every move.

    Using a web camera equipped in Jennifer's Los Angeles apartment, the monitor in Phoenix tracked how frequently her eyes moved from the computer screen and listened for the secret sounds of a possible helper in the room. Her Internet access was locked —remotely—to prevent Internet searches, and her typing style was analyzed to make sure she was who she said she was: Did she enter her student number at the same speed as she had in the past? Or was she slowing down?

    In the battle against cheating, this is the cutting edge and a key to encourage honesty in the booming field of online education. The technology gives trust to the entire system, to the institution and to online education in general. Only with solid measures against cheating, experts say, can Internet universities show that their exams and diplomas are valid — that students haven't just searched the Internet to get the right answers.

    Although online classes have existed for more than a decade, the concern over cheating has become sharper in the last year with the growth of "open online courses." Private colleges, public universities and corporations are jumping into the online education field, spending millions of dollars to attract potential students, while also taking steps to help guarantee honesty at a distance.

    Aside from the web cameras, a number of other high-tech methods are becoming increasingly popular. Among them are programs that check students' identities using personal information, such as the telephone numbers they once used.

    Other programs can produce unique exams by drawing on a large list of questions and can recognize possible cheaters by analyzing whether difficult test questions are answered at the same speed as easy ones. As in many university classes, term papers are scanned against some large Internet data banks for cheating.

下列说法错误的是(   )

按要求书写名称或结构简式：

阅读下面的材料，根据要求写作。

材料一：

前苏联教育家苏霍姆林斯基曾说过：“有时宽容引起的道德震动比惩罚更强烈。”

材料二：

2020年12月29日，教育部出台《中小学教育惩戒规则(试行)》，把教育惩戒纳入法治轨道。

要求：综合上面两则材料内容及含义，选好角度，确定立意，明确文体（不得写成诗歌），自拟标题；不要套作，不得抄袭；不少于800字。

下列化学用语的使用错误的是（   ）

It is important for us to employ a word or phrase according to the ________ in language studies.

He smiled suddenly, (露出) a set of amazingly white teeth.

下列说法正确的是(    )

已知矩阵 ，A的逆矩阵 .

The company's exports have been increasing (平稳地).

—What are the villagers talking about now?

—The (灌溉) this year.

N_A表示阿伏加德罗常数，下列说法中正确的是（   ）

钠，镁，铝，铁四种金属组成的混合物6 g，与足量的稀硫酸反应，产生标准状况下的氢气6.72 L，由此判断混合物中必含(    )

How long does it take to get through the (海关)？

Your teacher's words will be ________you in all your life，so you should remember them forever.

下列化学用语的理解正确的是（   ）

同温同压下，质量忽略不计的两个气球A和B，分别充入X气体和Y气体，且两气球的体积相同。若相同条件下，A气球放在CO中静止不动，B气球放在CO中上浮。下列叙述错误的是( )

任务型阅读

    You walk into the classroom, look at that white piece of paper in front of you and are told you've got an hour and a half to do it. That can make anyone nervous, but here is the guide to stay calm.

    Get a good night's sleep the night before the test, and eat a healthy breakfast next day. If you're too tired, you won't remember what you learnt the night before.

    Get to class a little earlier. If you get there early, you'll make sure to get your favorite seat.

    Breathe. Before the test, breathe in through your nose deeply and slowly. Repeat this several times. If you experience a sudden panic during the test, perform the exercise again.

    Skip questions if necessary. If you come across a difficult question, skip the question and move on. You can come back to it at the end of the test if you have time, and later questions may help you get the answer(s) to the one(s) you skipped.

    Don't panic if you notice other students writing very quickly or handing in their tests early. Tell yourself it's just a test. Really, it is. No matter what happens, everything will be OK.

A. Avoid staying up the night before the exam. B. Act like you are the only person in the room. C. Don't spend too much time on any one question. D. If you believe you can do it, you will find you can! E. A little exercise will help you remain calm during any stressful situation. F. Then, hold your breath for 3-4 seconds and blow out slowly through your mouth. G. You'll not also feel more relaxed if you don't get there in time or worse yet, late.