1、专题限时集训(三十)概要写作()A (2020浙江绍兴诊断性考试)阅读下面短文，根据其内容写一篇60词左右的内容概要。If youre worried that too much“screen time”could badly influence your childs intelligence，new research suggests you might be right.By analyzing the data gathered from over 4，500 US.kids aged between 8 and 11 in 2016 and 2017，Jeremy Walsh，a p
2、ostdoctoral fellow with the CHEO Research Institute in Ottawa，found that too much“screen time” could harm your childs intelligence.Kids with the sharpest intellect spent less than two hours a day on their cell phones, tablets and computers coupled with 9 to 11 hours of sleep and at least an hour of
3、physical activity.Too much screen time could affect kids ability to focus，especially if they are switching between apps on a device or between different screens at the same time，Walsh suggested.“One leading theory is that much time on screens is spent using multiple apps or devices at once，”he said.
4、“This can interfere with a childs ability to focus on and keep interested in a task.It can damage the building blocks for good cognition(认知)”“Sleep is important for brain development，since thats when the brain reorganizes itself and grows，”Walsh added.Besides，exercise has been shown to increase bloo
5、d flow to the brain and oxygenation of brain tissues, and increase the connectivity of networks in the brain.Too much screen time could lead to a“cascade”effect(级联效应) where kids dont get enough sleep and then are less active during the day.“You can see how this would have an impact on brain health，”
6、Walsh said.What should parents do？Walsh advised them to set firm rules about the use of screens including how long children are using the screens，the kinds of apps they are using and how many screens they are using at once.Concerned parents also should preview games or apps before letting their chil
7、d play，seek out more interactive(交互的) options that engage the childs mind，use parental controls to block or filter the content and limit the screen time._【参考范文】New research has found that excessive“screen time” may negatively affect childrens intelligence.(要点1)It prevents children from focusing and
8、staying interested，thus restricting their cognitive development.(要点2)Also，it results in inadequate sleep and lack of physical activity，which can do harm to the brain health.(要点3)Accordingly，parents are advised to establish strict regulations concerning the use of screens，monitor the content and limi
9、t the screen time.(要点4)B阅读下面短文，根据其内容写一篇60词左右的内容概要。Speed is very important in avalanche(雪崩) rescues.There will be narrow chances to escape if a skier is buried for 30 minutes or more.Now that 30 minutes can mean the difference between life and death for a skier lost on a snowy mountain，most people wo
10、uld depend on lifesaving dogs.Noble works as a rescue team member in a vacation land，California.He tells us，“Dogs run fastest when an accident happens.”His partner Wylee，a lifesaving dog，can search an accident scene the size of a football field.It only needs 5 to 10 minutes.However，5 rescue team mem
11、bers have to spend a couple of hours in the same area.Apart from its excellent speed，Noble chooses Wylee as his partner partly because it weighs only about half what other kinds of dogs weigh.Rescue team members have to carry their dogs to search sites in addition to carrying 60pound backpacks with
12、food，water and other equipment.The dogs need the lift so that dont get tired before they start working.There arent adequate data on how often dogs take part in avalanche searches or how often they are able to help local people in danger.But the dogs dont save that many people.Thats because there are
13、nt that many to save.A quarter of people in danger die from serious injuries before the snow stops moving.Of those buried who werent killed by injuries，half die within 20 minutes.If there is a chance of rescue，though，the dogs also cut search time for the remains.Erica Mueller，a famous director，wante
14、d to see how the lifesaving dogs worked，so she volunteered to spend part of an hour in a roomy snow cave waiting to be found.She was armed with a radio and was wearing several layers to stay warm.After being rescued by Wylee，she said，“I cant talk like a survivor，but it was definitely a cool way to s
15、ee how well trained those dogs are.”_【参考范文】Lifesaving dogs are of vital importance and help in avalanche rescues due to their excellent speed.(要点1)In addition，another advantage of lifesaving dogs is their light weight.(要点2)Nonetheless，the number of people rescued was not large owing to serious injuries and limited time.(要点3)However，through an experiment，a famous director Erica Mueller，spoke highly of the lifesaving dogs in avalanche rescues.(要点4)
