题目内容
In the clause".. that we are unconscious in sleep"(Paragraph 3), the word "unconscious" means _______ .
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Passage 3Space is a dangerous place , not only because of meteors but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through, and this is essential for plants to make the food which we eat. Heat , too , makes our environment endurable. Various kinds of rays come through the air from outer space，but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation. But their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage.Radiation is the greatest known danger to explorers in space. The unit of radiation is called”rem”. Scientists have reason to think that a man can put up with far more radiation than 0.1 rem without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is extremely difficult to be sure about radiation damage- a person may feel perfectly well, but the cells of his or her sex organs may be damaged, and this will not be discovered until the birth of deformed children or even grandchildren. Missions of the Apollo flights have had to cross belts of high radiation and ，during the outward and return journeys, the Apollo crew accumulated a large amount of rems. So far , no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short. We simply do not know yet how men are going to get on when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage done by radiation, but no really effective ones have been found so far.71. According to the first paragraph, the atmosphere is essential to man in that ______ .
Passage 4How men first learned to invent words is unknown; in other words, the origin of language is amystery. All we really know is that men, unlike animals, somehow invented certain sounds to expressthoughts and feelings, actions and things, so that they could communicate with each other; and that laterthey agreed upon certain signs, called letters, which could be combined to represent those sounds andwhich could be written down. Those sounds, whether spoken, or written in letters, we callwords.The power of words then , lies in their associations---the things they bring up before our minds.Words become filled with meaning for us by experience; and the longer we live, the more certain words recall to us the glad and sad events of our past; and the more we read and learn, the more the number of words that mean something to us increases.Great writers are those who not only have great thoughts but also express these thoughts in words which appeal powerfully to our minds and emotions. This charming and telling use of words is what we call literary style. Above all, the real poet is a master of words. He can convey his meaning in words which sing like music, and which by their position and association can move men to tears." We should therefore learn to choose our words carefully and use them accurately, or they will make our speech silly and rude.76. The origin of language ________ .
What is true about words?
The real power of words exists in their _______ .
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