1、专题强化练(二十一)概要写作()阅读下面短文，根据其内容写一篇60词左右的内容概要。AIt is early in the morning and Ive hardly caught any shuteye. My breakfast of eggs，bread and strong coffee will keep me awake and alert before lunch.After lunch，I will face an afternoon of yawning in the office.Sometimes I feel uneasy about this situation b
2、ut I am sure that I am not alone，for it is not too much to say that we all seem to be yawning more often.Are we turning into a generation of insomniacs (患失眠症的人)? How is modern life influencing our sleep patterns?We can start by blaming the light bulb and other forms of manmade light.Experts say that
3、 on average people go to bed and wake up two hours later than the previous generation.Then，there are the computers.Research led by Professor Charles Czeisler of Harvard Medical School has shown that people who read electronic books before going to bed take longer time to fall asleep.They have lower
4、levels of melatonin，a chemical which controls our body clock.And theyre less active in the morning.Professor Czeisler said，“In the past 50 years，there has been a decrease in average sleep length and quality.Since more people are choosing electronic devices for reading，communication and entertainment
5、，especially teenagers who already experience serious sleep loss，research on the longterm influence of these devices on health and safety is urgently needed.”So the first thing to do if you want to have a restful night is leave computers out of the bedroom.The earlier you get your fingers off the key
6、board，the sooner you tend to fall asleep.Avoid alcohol，as it might reduce our cycles of the “rapid eye movement” sleep，when our brains process the information we have received during the day.It prevents our brain activity going well.And do not eat nuts or cheese in the evening. After that，if you sti
7、ll cannot sleep，start counting sheep.Maybe that is the best way to avoid another afternoon of yawning in the office._【参考范文】Modern people suffer from sleeplessness and consequently get into a state of tiredness easily.(要点1) This phenomenon results from the negative effects of artificial light and com
8、puters.(要点2) So in order to solve the problem，people are advised to reject computers，resist alcohol as well as refuse nuts or cheese before bedtime.(要点3)Even counting sheep may help solve the problem in some way.(要点4)BDo you ever wonder why the weather seems unpredictable these days? The unpredictab
9、ility of the weather is caused by global warming，or climate change.Global warming is caused by the gradual increase in the earths average temperature.Climate scientists agree on the primary cause of global warming.According to Karl，Melillo and Peterson，the atmosphere is trapping heat from the emissi
10、on of certain gases，such as water vapor，methane，carbon dioxide，and nitrous oxide.This is mainly the fault of humans.We ought to be concerned about the potential danger of global warming.Not only will global warming cause many economic problems，but it will also destroy the land and even kill people.M
11、any economic problems will be caused by global warming，especially if we wait to address the issue.The change in climate makes already drought areas grow drier with the heat.This affects agriculture in a negative way.If the ground is too dry，farmers will have a hard time preparing the soil in order t
12、o produce good crops.Dry soil doesnt allow grass to grow effectively.Without the nutritious grass needed for grazing(放牧)and with the additional problem of heat stress，many farm animals may become sick，causing farmers even more expenses.Another economic problem caused by global warming involves cooli
13、ng systems.According to Jeff Spross，the constant warming of the earth will result in greater efforts to reduce heat in public places and to cool down homes.The energy it takes to keep buildings cool will cost over $200 a year per person.The increased temperature of the earth can also cause heat stro
14、kes and exhaustion in humans，making it nearly impossible for people to work outside.This will lower the labor productivity because many occupations，such as park ranger，mailman，landscape architect and farmer，require outdoor activities.As discussed briefly above，global warming can destroy land.Global
15、warming is not just a slight problemits fatal.Instead of waiting and allowing the problem to get worse，we need to take action against global warming immediately._【参考范文】The fault of humans causes global warming，which may cause many problems.(要点1) Global warming makes drought areas grow drier with the
16、 heat，causing farmers more expenses.(要点2)It will make the cost of keeping buildings cool much higher and add great difficulty to working outside.(要点3)Therefore，we should take action against global warming immediately.(要点4)C(2020浙江嘉兴期中)Most people around the world are righthanded.This fact also seems
17、 to have held true throughout history.In 1977 scientists studied works of art made at various times in history.Most of the people shown in these works of art are righthanded，so scientists guessed that righthandedness has always been common.But what do Leonardo da Vinci，Marie Curie，and Albert Einstei
18、n have in common? They were all lefthanded along with other famous people including Brad Pitt，Prince William，and Barack Obama.In fact，an estimated 13 percent of the worlds population may be lefthanded. Many researchers claim to have found relationships between lefthandedness and various physical and
19、 mental characteristics，such as blond hair，blue eyes，and sleep difficulties.Other studies have found a higherthannormal level of lefthanded people in certain occupations (职业)，including professional baseball players，architects，as well as prisoners.However，some of these connections are very weak，and o
20、thers have not been proven.What makes a person become righthanded rather than lefthanded？One simple idea suggests that people normally get righthandedness from their parents.Studies have found that two righthanded parents have only a 9.5percent chance of having a lefthanded child，while two lefthande
21、d parents have a 26percent chance of having a lefthanded child.Another common theory is that lefthanded people suffer mild brain damage during birth，which makes them lefthanded. Whatever the reasons behind it，peoples attitudes toward lefthandedness have changed a lot over the years.Statistics show t
22、hat although 13 percent of young people are lefthanded，only six percent of the elderly are lefthanded.Lefthanded children used to be punished until they began using their right hand like other children，but today people who are lefthanded are no longer looked down on nor are they considered abnormal.
23、For most people today，either case is perfectly acceptable.There are even a number of shops now selling products for lefthanded people，such as lefthanded can openers，guitars，and even a lefthanded camera._【参考范文】While most of the worlds population is righthanded, a minority are lefthanded. (要点1)Many re
24、searchers claim lefthandedness has something to do with physical and mental features and professions, but these assumptions lack solid evidence. (要点2) Some think lefthandedness is genetic while others attribute it to mild brain injury during birth. (要点3)Nowadays, peoples attitudes toward lefthandedness have changed a lot with the whole society accepting lefties more than before.(要点4)