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Classrooms Are Growing GreenerA"green classroom" used to refer to the color of paint on the wall. But today's green classrooms are greener than that! New"green" classrooms help schools save money and provide clean environments where students learn better.Many classrooms are going green by adding a group of solar panels（太阳能电池板）to their roofs to absorb the sun's rays. The solar panels collect energy from the sun and use it to power lights and computers. They create at least as much electricity as the classrooms use. In addition, new lighting and air systems can be programmed to lower energy costs and water use.Many new"green" classrooms are built using recycled materials. Some even use small pieces of material from blue jeans to cover walls and ceilings. This cuts heat and air conditioning bills, and it helps to soundproof （隔音）classrooms, too.Green schools include many other new ideas. Some classrooms are painted with special smell-free paints that help improve indoor air.Some use no glues as they add chemical smells to the air. Others use three sheets of glass in windows and skylights to help keep classrooms warm in cold weather and let in a lot of natural daylight.Experts say the benefits of building greener classrooms go beyond cost savings.Studies show that a healthful environment with good air quality can reduce colds and flu by more than 50 percent. That means fewer sick days for students and teachers. Studies have also shown that natural light and other green parts of the classroom improve students'learning and test scores.11. The new green classroom refers to one that（）12.Lower costs for energy and water use are achieved by（）13.Old blue jeans are used in building some green classrooms to（）14.Indoor air quality can be improved by using（）15.What is the benefit of building greener classrooms?

A Good Deed Each DayEvery New Year's Day, millions of people make a resolution, but it usually falls by thewayside within a few months, wecks or even days. However,26-year-old Luke Cameron is not one of them. The young man decided to do at least one good deed a day, for 366 days—and he has not missed yet.Luke did his first good deed on January 1,2020.He simply greeted a waitress when he visited a café.The next day he bought food and drinks for some homeless people.And he followed it up by giving coins to a woman, as she did not have enough to feed a parking meter.Though most of his kind gestures have been welcomed,Luke says there have been a few awkward（尴尬的） situations. Once,as he was trying to give away a £20 bill to an old lady,her granddaughter expressed doubt about his purpose.Another time he bought a sausage roll for a homeless man, but this man happened to be a vegetarian（素食者）.Luke has carefully recorded his good deeds in an online diary. Most of them have been about helping people with small things-like taking out the garbage for an old neighbour or helping a disabled lady pick out a dress for a party. However, the young man has also spent nearly £4,000 of his own money buying gifts for the children in need.Luke's kind deeds won him a good reputation（名声）. He was offered a job for which he can earn £35,000 a year.Now the young man plans to continue doing good deeds well after the first 366 are done, on December 31,2020.1.Many people fail to keep their new year's resolutions.2.Luke did not make a New Year resolution for 2020.3.Luke has been doing good things each day since the New Year's Day.4.Luke's first good deed was to buy food and drinks for the homeless.5. Luke was in charge of a car park.6. The old lady's granddaughter appreciated Luke's donation.7.Luke did not want pcople to know about his good deeds.8.Luke bought some gifts for the children in need with his own money.9.Luke believes that doing small favors is more valuable than money donation.10.Luke plans to continue helping others in the year 2021.

如下图所示，为某公司办公室局域网的网络结构示意图，集线器为10Mbps，网络为10Mbps。请完成下列问题：（1）图中每台计算机的平均带宽是多少？（3分）（2）如果将集线器替换为10Mbps交换式集线器，则每台主机的平均带宽是多少？（3分）（3）如果每台计算机平均带宽要达到100Mbps，请提出一个设计方案，需要更换哪些设备？（6分）

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