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The first two stages in the development of civilized man were probably the invention of primitive weapons and the discovery of fire, al though nobody knows exactly when acquired the use of (1) .The (2) of language is also obscure. No doubt it began very gradually. Animals have a few cries that serve (3) signals, (4) even the highest apes have not been found able to pronounce words (5) with the most intensive professional instruction. The superior brain of man i, apparently (6) for the mastering of speech. When man became sufficiently intelligent, we must suppose that he (7) the number of cries for different purposes. It was a great day (8) he discovered that speed could be used for narrative. There are those who think that (9) picture language preceded oral language. A man (10) a picture on the wall of his cave to show (11) direction he had gone, or (12) prey he hoped to catch. Probably-picture language and oral language developed side by side. I am inclined to think that language (13) the most important single factor in the development of man. Two important stages came not (14) before the dawn of written history. The first was the domestication of animals; the second was agriculture. Agriculture was (15) in human progress to which subsequently there was nothing comparable (16) our own machine age. Agriculture made possible (17) immense increase in the number of the human species in the regions where it could be successfully practiced. (18) were, at first, only those in which nature fertilized the soil (19) each harvest. Agriculture met with violent resistance from the pastoral nomads, but the agricultural way of life prevailed in the end (20) the physical comforts it provided. 6（）
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The first two stages in the development of civilized man were probably the invention of primitive weapons and the discovery of fire, al though nobody knows exactly when acquired the use of (1) .The (2) of language is also obscure. No doubt it began very gradually. Animals have a few cries that serve (3) signals, (4) even the highest apes have not been found able to pronounce words (5) with the most intensive professional instruction. The superior brain of man i, apparently (6) for the mastering of speech. When man became sufficiently intelligent, we must suppose that he (7) the number of cries for different purposes. It was a great day (8) he discovered that speed could be used for narrative. There are those who think that (9) picture language preceded oral language. A man (10) a picture on the wall of his cave to show (11) direction he had gone, or (12) prey he hoped to catch. Probably-picture language and oral language developed side by side. I am inclined to think that language (13) the most important single factor in the development of man. Two important stages came not (14) before the dawn of written history. The first was the domestication of animals; the second was agriculture. Agriculture was (15) in human progress to which subsequently there was nothing comparable (16) our own machine age. Agriculture made possible (17) immense increase in the number of the human species in the regions where it could be successfully practiced. (18) were, at first, only those in which nature fertilized the soil (19) each harvest. Agriculture met with violent resistance from the pastoral nomads, but the agricultural way of life prevailed in the end (20) the physical comforts it provided. 19（）
The first two stages in the development of civilized man were probably the invention of primitive weapons and the discovery of fire, al though nobody knows exactly when acquired the use of (1) .The (2) of language is also obscure. No doubt it began very gradually. Animals have a few cries that serve (3) signals, (4) even the highest apes have not been found able to pronounce words (5) with the most intensive professional instruction. The superior brain of man i, apparently (6) for the mastering of speech. When man became sufficiently intelligent, we must suppose that he (7) the number of cries for different purposes. It was a great day (8) he discovered that speed could be used for narrative. There are those who think that (9) picture language preceded oral language. A man (10) a picture on the wall of his cave to show (11) direction he had gone, or (12) prey he hoped to catch. Probably-picture language and oral language developed side by side. I am inclined to think that language (13) the most important single factor in the development of man. Two important stages came not (14) before the dawn of written history. The first was the domestication of animals; the second was agriculture. Agriculture was (15) in human progress to which subsequently there was nothing comparable (16) our own machine age. Agriculture made possible (17) immense increase in the number of the human species in the regions where it could be successfully practiced. (18) were, at first, only those in which nature fertilized the soil (19) each harvest. Agriculture met with violent resistance from the pastoral nomads, but the agricultural way of life prevailed in the end (20) the physical comforts it provided. 20（）
重金属因易在人体内积蓄引起慢性中毒，也应严格控制其限量，一般规定最大允许量是
Text 3After watching my mother deal with our family of five, I can’ t understand why her answer to the question, "What do you do’ is al ways, "Oh, I’ m just a housewife. ’ JUST a housewife Anyone who spends most of her time in meal preparation and clean-up, washing and drying clothes, keeping the house clean, leading a scout troop, playing taxi driver to us kids when it’ s time for school, music lessons or the dentist, doing volunteer work for her favorite charity, and making sure that all our family needs are met is not JUST a housewife, She’s the real Wonder Woman.Why is it that so many mothers like mine think of themselves as second - class or something similar Where has this notion come from Have we males made them feel this way Has our society made "going to work" outside the home seem more important than what a house wife must face each dayI would be very curious to see what would happen if a housewife went on strike. Dishes would pile up. Food in the house would run out. No meals would appear on the table. There would be no clean clothes when needed. High boots would be required just to make it through the house scattered with garbage. Walking and bus riding would increase. Those scout troops would have to break up. Charities would suffer.I doubt if the man of the house would be able to take over. Oh, he might start out with the attitude that he can do just as good a job, but how long would that last Not long, once he had to come home each night after work to more household duties. There would be no more coming home to a prepared meal; he’ d have to fix it himself. The kids would all be screaming for something to eat, clean clothes and more bus fare money. Once he quieted the kids, he’d have to clean the house, go shopping, make sure that kids got a bath, and fix lunches for the next day. Once the kids were down for the night, he might’ be able to crawl into an unmade bed and ,try to read the morning newspaper.No, I don’ t think many males are going to volunteer for the job. I know I don’ t want it. So, thanks, mom ! I’ ll do what I can to create a national holiday for housewives. It could be appropriately called Wonder Woman Day. In the author's opinion,（）
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