桃花源记
主题语境(二) 地球与宇宙奥秘探索
踏青造句
阅读理解
A (2018·北京卷·B)
Find Your Adventure at the Space and Aviation(航空） Center
If you’re looking for a unique adventure， the Space and Aviation Center （SAC) is the place to be.The Center offers programs designed to challenge and inspire with handson tasks and lots of fun.
More than 750,000 have graduated性吧有你最新地址 from SAC， with many eking employment in engin
eering， 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.
疼爱宝贝父子
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油茶籽油 badge as they learn about waterand landsurvival through designed tasks and their arch and rescue of a “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, w
ith 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， plea visit us online at www.oursac。com。
【语篇解读】 本文为说明文。文章主要介绍了宇航中心培训项目的情况，命题时从读者的真实需求出发，着重考查培训项目的相关内容和特点。激发考生的航天梦想,探险精神和团队合作精神.
1．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。
A [细节理解题。根据文章第一段第一句“If you're looking for a unique adventure, the Space and Aviation Center (SAC） is the place to be."可知,人们来SAC是为了寻找与众不同的冒险体验,故选A.]
2．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
D ［细节理解题。根据文章第三段“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.”可知,要想获得太空探险徽章需要建造和发射火箭模型、学习太空任务、尝试与其他飞行员模拟太空飞行等，故选D。］传神翻译公司
3．What is the most important for trainees?
A．Leadership. B．Team spirit.
C．Task planning. D．Survival skills.
B ［推理判断题。根据文章第四段“With all the programs, teamwork is key as trainees learn the importance of leadership and being part of a bigger task.”可知，对于受训者来说，团队合作是关键，故团队精神是最重要的，故选B。]
B （2018·北京卷·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. So 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。
Rearchers 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 rearchers 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视频如何美颜 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.“Wax is a complex mixture， but the basic bond in polyethylene, the carbon。carbon bond, is there as well, ”she explains， “The wax worm evolved a method or system to break this bond。"
天蝎座和金牛座配吗
Jennifer DeBruyn， a microbiologist at the University of Tenne， who was not involv
ed 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 cau of the breakdown.Is it an enzyme produced by the worm itlf 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 “millions of worms thrown on top of the plastic。”
