题目

某化学反应可表示为：二氧化碳＋水 M＋氧气。根据以上信息，判断下列关于M组成的说法中正确的是( ) A．一定含有C、H元素，可能含有O元素 B．只含有C、 H元素 C．含有C、H、O三种元素 D．无法确定 答案：AIn learning English, one should first pay attention to listening and speaking.It is the groundwork(基础)of reading and writing.You’d better try your best to speak while you do much listening.Don’t be afraid of making mistakes.But be careful not to let them stop you from improving your English.While you are doing this, a good way is to write---keep a diary, write notes or letters, and then if you can, ask someone else to go through(检查)what you have written and tell you what is wrong.Many mistakes in your speaking will be easily found when you write.Through correcting the mistakes, you can do better in learning English.If you are slow in speaking, don’t worry.One of the helpful ways is reading, either aloud or to yourself.The important thing is to choose something interesting to read.It mustn’t be too difficult for you.When you are reading in this way, don’t stop to look up the words if you can guess their meanings, or they have nothing important to do with the sentence.You can look them up later.小题1:For the beginners, listening and speaking is ______.A．more important than reading and writingB．not so important as reading and writingC．as important as reading and writingD．not so useful in learning English小题2:When you are speaking, _______.A．you shouldn’t make any mistakesB．you must speak slowlyC．it doesn’t matter if you make any mistakesD．you had better take a dictionary with you小题3:One of the good ways to find your mistakes in your speaking is to______.A．speak as much as possibleB．write notes or lettersC．ask some Americans to speak with youD．read more English books小题4:If you want to be fast in speaking, you should choose something_____.A．difficult to read aloudB．easy to read to yourselfC．interesting to read to yourselfD．important to read aloud小题5:In reading, if you meet a new word which has something important to do with the sentence, you’d better_______.A．stop to look it upB．not look it up and just go on readingC．stop reading at onceD．not stop to look it up