— Robert is indeed a wise man

— Oh, yes. How often I have regretted_______ his advice!

Luckily, the accident didn't do________ either of the cars.

在△ABC中，若sin²A=sinB•sinC且（b+c+a）（b+c﹣a）=3bc，则该三角形的形状是（  ）

He teaches his children how to read and write. , he teaches them how to behave themselves.(而且)

Mike didn't play football yesterday because he had ________his leg.

用所给短语的正确形式填空

语法填空。

Few people would even think of beginning a new job at the age of 76, one of America's most famous artists did just that.Anna Mary Robertson, better known as “Grandma Moses”， turned to painting she was too old to work on her farm.

Grandma Moses was crazy about painting soon after she picked it up and worked hard at it.She painted (care) and her works were nice.She first painted only to please ， and then began to sell her works a little money.In 1993, a collector, Louis Caldor happened to see several of Grandma Moses' works (hang) in a shop.He liked them, (buy) them at once, and set out to look for ．Caldor held show to introduce the works of Grandma Moses to other artists. Grandma Moses, was world­famous, died on December 13, 1961, at the age of 101.

某物质R完全燃烧的化学方程式为：2R+3O₂ 2CO₂+4H₂O有关该反应，有下列说法：

①R一定含碳、氢两种元素，可能含有氧元素    

②R中碳元素的质量分数是37.5%

③6.4g R完全燃烧，转移1.2N_A个电子           

④R的摩尔质量为32，若6.4g R完全燃烧生成8.8g CO₂ ，

则正确的一组是（   ）

选择适当的短语并用其正确形式填空

根据提示用单词的正确形式填空。

对下列画横线的病句修改最恰当的一项是（   ）

只要沉得下心，坐得住“冷板凳”，才能真正做出经得起时间检验。

阅读理解

    In certain countries of the world，the king or queen is still the head country。The UK is one of these countries。So that does the British royal family(皇室) represent for the British people today? Well，a large number of things。The royal family are of course a part of British history and tradition。They still have an important and meaning for many people today。It just wouldn't feel the same if there were no royal family。In addition to that，the queen has important formal duties：

    ●as head of the state，the Queen represents the UK on visits other would leaders to visit the UK.

    ●as head of the armed force，only the Queen can declare when the UK is at war or when the war is over。

    ●as head of the Church of England。

    Not just the Queen，the royal family spend a great deal of their time traveling up and there should be royal family。Sometimes the press and media criticize（批评）the royal family as well。One criticism is that the British people should not have to pay for the royal through their taxes。Another is that the Buckingham Palace should be open to the public more often，in order to pay for the building repairs that are necessary。

根据提示补写出下列句子中的空缺部分。

下列各组微粒或物质的相互关系，属于同位素的是（   ）

在标准状况下，将50mlNO₂和O₂的混合气体通入水中，最终得到10ml无色气体，则NO₂和O₂的体积之比可能是（   ）

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。

Tips on how to save money

    It's important for you teenagers to know how to save money. You know that the money you save can be for rainy days and be used to pay through your college education. If you think it's a difficult task and don't know how to do it, please do as the following.

   

    My dad always tells me that if one doesn't respect money, it will never respect you. Hence, it's important that you keep a record of your daily expenses. Make it a habit to write down all that you have spent. And when you find out the total expenses at the end of the month, you will realize what you have spent more money in doing. 

    Open a savings account.

    Opening a savings account is a better way to save money. You can set a goal; say (for example), the money is for a new notebook or for college, and then save, until you have enough money to buy a notebook or until you go to college.

    Do not carry much cash.

    Do you have the habit of not leaving a store without buying anything? The only way to stop that is carrying less money around with you. Go to the store with the minimum amount of money, which will not even help you buy a drink.

    Save the changes.

    Save the changes that you get back. If you have gone to a shop to buy something and get back some changes, then do not spend them.  And you'll be surprised at the huge amount of money after days.

    Follow these tips above, and thus you can save a lot of money. And surely, they'll help you to be more responsible in your life.

A. Keep a record of your daily expenses. B. After a few days, you'll get rid of this habit. C. Instead, you can save them in your piggy bank. D. By that time, you will realize the importance of saving money. E. Saving money builds your financial power and personal freedom. F. Next month, you will automatically try and save more in that part. G. Nowadays in the developed and developing countries, people are all working for the sake of earning money.

在体积为V L的密闭容器中通入a mol CO和b mol O₂ ， 点燃充分反应后容器内碳原子数和氧原子数之比为（　　）

We were leaving here it suddenly began to rain heavily.

载人飞船上，两副硅太阳能电池帆板提供了飞船所需的电力．请画出硅原子的原子结构示意图．

补写出下列句子中的空缺部分。