某物质A在一定条件下加热分解，产物都是气体，分解方程式为2A＝B+2C+2D。测得生成物的混合气体对氢气的相对密度为d，则A的相对分子质量为（   ）

One of her acquaintances was going through a very messy divorce and was very depressed. She tried to her (使……振作起来).

N_A代表阿伏加德罗常数的值。下列叙述正确的是( )

下面是一份请柬中的四句话，其中表述得体的一句是（   ）

我校文学社定于本月18日晓7点在学校礼堂举行“民俗文化报告会”。您是著名的民俗专家，（甲）对民俗文化的研究造诣应该深厚 ， （乙）今诚挚邀请您莅临会议 ， 为我社民俗文化活动的开展（丙）做出认真的指导。（丁）敬请务必光临。

在体积相同的密闭容器中分别充满O₂、O₃气体，当这两个容器内气体的温度和密度相等时，下列说法中正确的是（   ）

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。

    The holiday season isn't just about shopping and gifts. However, holiday travel can be more expensive than the gifts. Fortunately, the following tips will help keep your travel spending under control.

● Plan ahead. The earlier you book your travel, from airfare to hotels, the easier it is to find good deals. Your best prices on airfare come when you book three weeks before the plane leaves for domestic flights. For international flights, consider booking 30 days in advance. Many experts point out that you should book travel between  one month and three months out for high-traffic holidays.

● Book your air travel on cheaper days. Traveling by air on Tuesdays and Wednesdays often costs less than traveling on Fridays and Sundays. During the holidays, it is not just about a specific day of the week. You also need to consider the days surrounding the holiday but days immediately before and after a holiday can be expensive. One of the best ways to save is to plan your air travel on the Day of the holiday.

● Consider traveling overnight. Red-eye flights and overnight flights often cost less than those at more convenient times. Traveling overnight can help you avoid a night in the hotel, as well as save your money on travel to your destination.

● You can't bring liquids with you on the airline, but you can bring sandwiches and other snacks. When you are on the road, you can buy food at local groceries to make your own meals. If you are staying in a hotel long-term, consider cooking your own food, especially if you have access to a microwave.

A. Bring your own food. B. Consider affordable accommodations. C. Traveling by plane is not the best choice. D. Plus, booking earlier can save you money. E. For instance, traveling on Christmas Day might be a great deal. F. A great deal of travel also takes place during this time of year. G. Other alternatives include sleeper trains, as well as overnight ferries.

— I haven't met anyone else here who can speak better French than you.

— Actually, I _______ in France for almost ten years.

四边形ABCD和四边形A'B'C'D'分别是矩形和平行四边形，其中点的坐标分别为A（﹣1，2），B（3，2），C（3，﹣2），D（﹣1，﹣2），A'（﹣1，0），B'（3，8），C'（3，4），D'（﹣1，﹣4）．求将四边形ABCD变成四边形A'B'C'D'的变换矩阵M．

 

改错题

Dear Editor,

    I am writing tell you about the discussion we've had about whether it is necessary of middle school students to have mobile phones. Most students think this is more convenient for them to keep in the touch with their parents and classmates. And what's much, it's a fashion. However, most teachers think middle school students are not old enough to control them. It is a waste of time for students to play games and sending messages on their mobile phones. Therefore, it is easy to make students contact with each other. In my opinion, following the fashion was understandable. But as middle school student, we should put all our energy into our study.

Yours truly,

Mary

毫无疑问，懂得一些急救知识很有必要，因为危险无处不在。

that it is necessary to know some knowledge of first aid as dangers lie everywhere.

The true value of life is not in ______, but _______.

Both of us have cars. Whom would you rather ________, John or me?

In my opinion, trousers made by hand are (比…好) to those made by machines.

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。

    Physical education plays a vital role in the students' development and growth. According to recent medical studies, physical well-being of a student is directly related to his or her performance whether in class or in the office.

It's a link to good health.

    It's only in physical educational classrooms that students learn the value of taking care of themselves through proper grooming, healthy eating and regular exercise.

    Many doctors today agree that obesity is a serious health risk. Without any form of diet management and control with the numerous processed food students intake every day, a student's health can easily be at risk to many diseases. Physical education in school is a preventive measure to teach students the value of regular exercise.

It promotes academic learning.

    Physical health allows students to function better in classrooms. A good cardiovascular system developed from regular exercise promotes excellent blood and oxygen circulation. This circulation produces longer attention span during classes allowing longer concentration and absorption.

It builds self-trust.

    Students who are active in physical activities are more confident with themselves according to most social school studies. It's probably because of the self-discipline and dedication to excel in a sport that brings out the best in students. In school, the physical education program introduces these sport activities to students.

It promotes a physically active lifestyle.

    The purpose of physical education is to instill in students, at an early age, the value of self-preservation and choosing a lifestyle that is good for both the mind and body.

A．The article will give you reasons to agree. B．It is the best way to cure your illnesses. C．The value of physical fitness can never be overstated. D．It's a preventive measure against disease. E．They can make choices about which sport they get involved in. F．Some students prefer to abandon such activities. G.  This means more nutrients circulate throughout the body.

Time turned the edge of his anger and he (原谅) the boy.

选择合适的短语填空。

Pick out  star in  build up   thanks to   be equipped with  focus on

标准状况下，①6.72L NH₃  ②1.204×10²³个 H₂S  ③5.6g CH₄  ④0.5molHCl，下列关系正确的是（   ）

行列式 中，元素-3的代数余子式的值为

阅读下面的文言文，完成下面小题。

袁甫，字广微，嘉定七年进士第一，迁秘书郎，寻迁著作佐郎、知徽州。治先教化，崇学校，访便民事上之。丁父忧 ， 服除，知衢州。移提举江东常平。适岁旱，亟发库庾之积，凡洲县窠名隶仓司者，无折旧皆住催。时江，闽寇迫饶，信，虑民情易动，分榜谕安之。霜杀桑，春夏雨久湖溢，诸郡被水，连请于朝，给度牒二百道赈恤之。行部问民疾苦，荐循良。劾奸贪。决滞狱。所至诣学宫讲说，创书院贵溪之南，祠先儒陆九渊。岁大旱，请于朝，得度牒、缗钱、绫纸以助赈恤。疫疠大作创药院疗之前后持节江东五年所活殆不可数计转将作监领事如故。迁秘书少监。入见，帝曰：“卿久劳于外，笃意爱民，每览所陈，备见恳恻。”时朝廷以边事为忧，史嵩之帅江西，力主和议。甫奏曰：“臣与嵩之居同里，未尝相知，而嵩之父弥忠，则与臣有故。嵩之易于主和，弥忠每戒其轻易。今朝廷甘心用父子异心之人，臣谓不特嵩之之易于主和，抑朝廷亦未免易于用人也。”疏入，不报。未几，复奏疏云：“臣于嵩之本无仇怨，但国事所系，谊难缄默。”殿中侍御史徐清叟复论甫守富沙日赃六十万，汤巾等又争之，清叟亦悔。嘉熙元年，迁中书舍人。入见，帝问边事，甫奏：“当以上流为急，议和恐误事。”时清叟与甫并召，而清叟未至。甫奏：“台谏风闻言事，初亦何心。令人物眇然，有如清叟宜在朝廷，辞避实惟臣故，乞趣其赴阙。”又奏备边四事，曰：固江陵，堰瓦梁，与流民复业。迁吏部侍郎兼国子祭酒，日召诸生叩其问学理义讲习之道。时边遽日至，甫条十事，至为详明。权兵部尚书，暂兼吏部尚书，卒 ， 赠通奉大夫，谥正肃。

（节选自《宋史•袁甫传》）

—What do you think of this ceremony?

—(总的来说),it is a great success.