发布时间 : 星期四 文章(完整word版)2018年北京高考英语试卷及答案,推荐文档更新完毕开始阅读d24c160741323968011ca300a6c30c225901f0a0
More than 750,000 have graduated from SAC, with many seeking employment in engineering, aviation, education, medicine and a wide variety of other professions. They come to camp, wanting to know what it is like to be an astronaut or a pilot, and they leave with real-world applications for what they're studying in the classroom.
For the trainees，the programs also offer a great way
to earn merit badges(荣誉徽章). At Space Camp, trainees can earn their Space Exploration badge as they build and fire model rockets, learn about space tasks and try simulated (模拟) flying to space with the crew from all over the world. The Aviation Challenge program gives trainees the chance to earn their Aviation badge. They learn the principles of flight and test their operating skills in the cockpit(驾驶舱)of a variety of flight simulators. Trainees also get a good start on their Wilderness Survival badge as they learn about water-and
land-survival through designed tasks and their search and rescue of “downed\pilot. With all the programs, teamwork is key as trainees learn the importance of leadership and being part of a bigger task.
All this fun is available for ages 9 to 18. Families can enjoy the experience together, too, with Family Camp programs for families with children as young as 7.
Stay an hour or stay a week--there is something here for everyone! For more details，please visit us online at . 40. Why do people come to SAC? A. To experience adventures. B. To look for jobs in aviation. C. To get a degree in engineering. D. To learn more about medicine.
41. To earn a Space Exploration badge, a trainee needs to . A. fly to space.
B. get an Aviation badge first. C. study the principles of flight. D. build and fire model rockets.
42. What is the most important for trainees? A. Leadership. B. Team spirit. C. Task planning. D. Survival skills.
C
Plastic-Eating Worms
Humans produce more than 300 million tons of plastic every year. Almost half of that winds up in landfills(垃圾填埋场)， and up to 12 million tons pollute the oceans. qSo far there is no effective way to get rid of it, but a new study suggests an answer may lie in the stomachs of some hungry worms.
Researchers in Spain and England recently found that the worms of the greater wax moth can break down polyethylene, which accounts for 40% of plastics. The team left 100 wax worms on a commercial polyethylene shopping bag for 12 hours, and the worms consumed and broke down about 92 milligrams, or almost 3% of it. To confirm that the worms' chewing alone was not responsible for the polyethylene breakdown, the
researchers made some worms into paste(糊状物) and applied it to plastic films. 14 hours later the films had lost 13% of their mass--apparently broken down by enzymes(酶)from the worms' stomachs. Their findings were published in Current Biology in 2017.
Federica Bertocchini, co-author of the study, says the worms' ability to break down their everyday food-beeswax--also allows them to break down plastic \mixture, but the basic bond in polyethylene, the carbon-carbon bond, is there
as well, \\
Jennifer Debruyn, a microbiologist at the University of Tennessee, who was not involved in the study, says it is not surprising that such worms can break down polyethylene. But compared with previous studies, she finds the speed of breaking down in this one exciting. The next step, DeBruyn says, will be to identify the cause of the breakdown. Is it an enzyme produced by the worm itself or by its gut microbes(肠道微生物)?
Bertocchini agrees and hopes her team’s findings might one day help employ the enzyme to break down plastics in landfills. But she expects using the chemical in some kind of industrial process-not simply \”
43. What can we learn about the worms in the study? A. They take plastics as their everyday food. B. They are newly evolved creatures. C. They can consume plastics. D. They wind up in landfills.
44. According to Jennifer DeBruyn, the next step of the study is to . A. identify other means of the breakdown B. find out the source of the enzyme C. confirm the research findings D. increase the breakdown speed
45. It can be inferred from the last paragraph that the chemical might . A. help to raise worms B. help make plastic bags C. be used to clean the oceans D. be produced in factories in future
46. What is the main purpose of the passage? A. To explain a study method on worms. B. To introduce the diet of a special worm. C. To present a way to break down plastics. D. To propose new means to keep eco-balance.
D
Preparing Cities for Robot Cars
The possibility of self-driving robot cars has often seemed like a futurist's dream, years away from materializing in the real world. Well, the future is apparently now. The California Department of Motor Vehicles began giving permits in April for companies to test truly self-driving cars on public roads. The state also cleared the way for companies to sell or rent out self-driving cars, and for companies to operate driverless taxi services. California, it should be noted, isn't leading the way here. Companies have been testing their vehicles in cities across the country. It's hard to predict when
driverless cars will be everywhere on our roads. But however long it takes, the technology has the potential to change our transportation systems and our cities, for better or for worse, depending on how the transformation is regulated.
While much of the debate so far has been focused on the safety of driverless cars(and rightfully so), policymakers also should be talking about how self-driving vehicles can help reduce traffic jams, cut emissions(排放) and offer more convenient, affordable
mobility options. The arrival of driverless vehicles is a chance to make sure that those vehicles are environmentally friendly and more shared.
Do we want to copy- or even worsen- the traffic of today with driverless cars? Imagine a future where most adults own individual self-driving vehicles. They tolerate long, slow journeys to and from work on packed highways because they can work, entertain themselves or sleep on the ride, which encourages urban spread. They take their driverless car to an appointment and set the empty vehicle to circle the building to avoid paying for parking.