As is often the case, little Tom, if ____________, is most likely to stop crying soon.

称取有机物A 6.0 g，在足量氧气中充分燃烧，并使产物依次缓慢通过浓硫酸、碱石灰，两者分别增重7.2 g和13.2 g。已知有机物A气态时的密度是相同条件下氢气密度的30倍。

请计算：

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。

    Anger is a completely normal, usually healthy human emotion.  Uncontrollable anger can lead to serious problems at work and in personal relationships, and may destruct(破坏) the individual's total quality of life.  

    Anger is not just a mental state of mind. Anger makes us ill.  When a human or animal decides to take action to stop or face a threat, anger usually becomes the main feeling and takes over our behaviour.

    In many cases humans and other animals express anger by making loud sounds, baring teeth, staring and adopting postures as a warning to perceived aggressors to stop their threatening behaviour.  If a stranger approaches a newborn dog, the mother will most likely growl, bare her teeth and adopt a defensive or ready-to-attack posture, rather than silently attack without any warning.

     His voice will be hostile(敌意的), as may his body language. Naturally, anger may grow in humans and other animals to protect territory and family members, prevent loss of possessions or food, and many other perceived threats.  

    The Mental Health Foundation, a UK charity, says that anger is one of the most basic human emotions. Experts say anger is a primary, natural emotion with functional survival values.  The raised heart rate, blood pressure and release of hormones prepare us physically for necessary action—which is either to fight or run away at top speed.  

A. Coping with anger is an acquired skill.

B. We all experience such emotion frequently.

C. We should learn how to control our anger.

D. It arouses an increase in heart rate, blood pressure and so on.

E. However, when it gets out of control, it can become destructive.

F. If you invade into the private land of a farmer, his approach may be similar.

G. It's unusual for a physical attack to happen without these signs appearing first.

阅读下面的材料，根据要求写作。

2020年12月11日，中央宣传部授予张桂梅老师"时代楷模"称号。张桂梅老师是云南省丽江市华坪女子高级中学校长，华坪县儿童福利院院长。张桂梅老师扎根边疆教育一线40余年，默默耕耘、无私奉献，为了改变贫困地区女孩失学辍学现状，推动创建了一所免费招收贫困女生的高中，2008年建校以来已帮助1800多位女孩走出大山走进大学，用知识改变贫困山区女孩命运，用教育阻断贫困代际传递。近日，张老师在《人民日报》撰文《传承红色基因，培育时代新人》，提出“让学生们远方有灯、脚下有路、眼前有光”，引发广泛讨论。

请结合材料内容，以“光明中学学生×××”的名义给张桂梅老师写一封信，要体现你的认识与思考。

要求：选好角度，确定立意，自拟标题；不要套作，不得抄袭；不得泄露个人信息；不少于800字。

—Don't you think Sam is the best person for the position？He is very wise.

—I don't quite agree. He is ________ wise.

The initials, WWF, (代表) World Wide Fund for Nature.

Rude behavior should not be (tolerate).

I am sorry, but I didn't mean to keep you waiting here so long. Can you ________ me?

已知=ad﹣bc，则+++=（　　）

My school has long been enjoying a high reputation and I have p much from it.

标准状况下，22 g CO₂的体积是(   )

假设你是红星中学高三学生李华，请给你的外教Mr. Black写一封邮件，邀请他参加你们学校举行的英语读书会(reading circle)活动，邮件的内容包括：

1）. 介绍读书活动的相关信息（例如：时间、地点、活动目的、内容等）；

2）. 说明你发出邀请的原因；

3）. 询问对方的意向。

注意： 1. 词数不少于100词；2. 开头和结尾已给出，不计入总词数。

Dear Mr. Black,

    ……

Yours,

Li Hua

I am afraid you'll have to be on for you heart trouble.

General secretary Xi Jinping urged Washington ________ concrete measures to loosen hightech export controls to China.

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

    Maybe you are more interested in sports than in history. You  (probable) think you will never be a top student. In fact, anyone can become  better student if he or she wants to. If you can use your time well, you may improve your study without much work. The following are my suggestions.

    Plan your time  (careful). You should make a list of things that you have to do. First write down the time for eating,(sleep), dressing, etc. Then decide on a good time for studying. Of course, studying shouldn't take all of your time. Don't forget  (leave) yourself enough time for hobbies.

    Find a good place to study. Look around the house for a good study place. Keep this space. It may be a desk just a corner of your room. No games, radios, or televisions! When you sit down to work, think only about the subject!

    Make good use  your time in class. Listen carefully to what the teacher says. Careful listening (mean) less work after class. You also need to take (note), because it can make it easier for you to learn well.

    These are only some of the ways to help you with your studying. I believe you'll find(many) other ways besides these.

N_A是阿伏加德罗常数的值，下列说法正确的是(    )

下列说法错误的是（   ）

Without money to buy food, he was forced to beg for a meal, driven by (饥饿).

已知一个关于x，y的二元线性方程组的增广矩阵是 ， 则2x+y= ．

当听到这则消息时，她惊讶地跳了起来。

When she heard the news, she jumped upright .