题目

若反比例函数的图象在第二、四象限，m的值为_____． 答案：【答案】-2【解析】由反比例函数的定义可知3-m2=-1，由反比例函数图象在第二、四象限可知m+1＜0．∵是反比例函数，∴3-m2=-1．解得：m=±2．∵函数图象在第二、四象限，∴m+1＜0，解得：m＜-1．∴m=-2．故答案为：-2．阅读下列短文，根据短文内容填写表格 (每空限填一词)。 The following are taken from the book of Cambridge Real English Skills. They are very helpful in learning English. Learning tip 1: When you read, it is not necessary to understand every word in the text. You only need to understand the parts of the text which contain (包含) the information you are looking for. Learning tip 2: Scanning is when we read a text quickly to find a particular piece of information. We do not read every word. We stop reading when we find the information we want. Learning tip 3: Make yourself ready for reading a text by thinking about the topic in your own language. This will help you to predict (预测) the content of the English text and working out the meaning of any unknown words. Learning tip 4: Skimming is when we read a text quickly to find out what it is about or to get a general idea. We do not read every word. We get the main idea and we don’t pay attention to details. Learning tip 5: When we read a text, we want to understand the writer’s message. To do this, we read silently. In real life, we sometimes read aloud—for example, we might read out something from a newspaper to a friend. Reading aloud does not help you to understand the message, but it helps you to practise the language. Learning tip 6: As you read, try to work out the meaning of unknown words. Find other words in the text which might help you with the meaning of the word you do not know. Perhaps some other words in the text have the same meaning—or the opposite meaning. Only use a dictionary to check your guesses. Learning tip 7: Your knowledge of grammar will not help you with the meaning of unknown words. But it will help you to decide whether words are nouns, verbs, etc. This will help you to link words in sentences and to read words in groups. Learning tip 8: You can use either a dictionary with English and your language or a dictionary which has definitions in English. The main advantage of using a dictionary which has definitions in English is that you are working in English all the time. These dictionaries also explain the different meanings that one word can have, and they give lots of examples of how words are used.   76   for Learning English Ø         It is   77   to know every word in the text while you are reading. But sometimes you should try to   78   the meaning of some unknown words with the help of other words. Ø         Scanning is a good   79   to help you find a particular piece of information when you read, but if you want to know the main idea of the text,   80   is very useful. Ø         Don’t always   81   a dictionary when you read a text, but think about the topic in your own language   82   reading the text, for it will help you know the meaning of unknown words. Ø         If we just want to understand the writer’s message, we do   83   reading. But reading aloud is   84   for you to practise the language. Ø         The knowledge of grammar can help to link words in sentences and to read words in groups, and a dictionary which has definitions in English can   85   you how words are used.