题目

我国神舟十一号飞船发射成功，使用的燃料中有液氢和液氧，下列说法中不正确的是A. 液氢是由原子构成的B. 液氢和液氧的燃烧不会产生雾霾C. 液氧的作用是支持液氢燃烧D. 氢元素与氧元素的本质区别是质子数不同 答案：【答案】A【解析】A. 液氢是氢气的的液态形式，是由氢分子构成的；B. 液氢和液氧的燃烧生成物只有水，不会产生雾霾；C. 液氧的作用是支持液氢燃烧，放出大量热，为火箭发射提供能量；D. 元素是具有相同质子数即核电荷数的同一类原子的总称，所以决定元素种类的是质子数，氢元素与氧元素的本质A rabbit is running into its hole. You may ask, “What happened?”Well, when a rabbit sees something dangerous, it runs away. Its tail moves up and down as it runs. When other rabbits see this tail moving up and down, they run too. They know that there is danger. The rabbit has told them something without making a sound. It has given them a signal.Many other animals use this kind of language. When a bee found some food, it goes back to his home. It cannot tell the other bees where the food is by speaking to them, but it does a little dance in the air. This tells the bees where the food is.Some animals say things by making sounds. A dog barks, for example, when a strangercomes near. A cat purrs (发出呼噜呼噜的声音)when pleased. Some birds make several different sounds, each with its own meaning.But human beings have something that no animals have –-- a large number of words about things, actions, feelings or ideas. We are able to give each other information, to tell or inform other people what is in our mind or how we feel. By writing words down we can remind ourselves of the things what have happened, or send messages to people far away. No animals can do this. No animals has the wonderful power of language.No one knows how man learned to make words. Somehow he learned to make them. As centuries went by, he made more and more new words. This is what we mean by language.  People living in different countries made different kinds of words. Today there are about fifteen hundred different languages in the world. A very large English dictionary, for example,  contains four or five hundred thousand words. But we do not know all these. The words we know are called vocabulary. We should try to make our vocabulary larger. Read as many books as possible. When we meet a new word, look it up in the dictionary. A dictionary is the Most useful book.小题1: When a rabbit gives the other rabbits a signal of danger, it _______.A．runs into its holeB．stops to move its tailC．runs with its tail moving up and downD．stops moving its tail up and down as it runs小题2: A dog can  tell something ________.A．by giving signalsB．by making different soundsC．by purringD．by barking小题3: It has been proved that no animal is able to _______.A．give the others informationB．tell others how it feelsC．express it actions and feelings with wordsD． make different sounds, each with its own meaning小题4:Generally speaking, what we mean by “vocabulary” is _________.A．all the words that we knowB．more and more words we useC．all the words we needD．the dictionary which contains thousands of words小题5: What must we do in order to make our vocabulary large?A．Make more and more new words.B． Learn more languages.C． Look up any new words in a dictionary.D． Try to read as many books as possible.