首页
登录
职称英语
[originaltext] Our Milky Way solar system began as small pieces of star-crea
[originaltext] Our Milky Way solar system began as small pieces of star-crea
游客
2023-08-09
28
管理
问题
Our Milky Way solar system began as small pieces of star-created gas and dust. They came together to form the Sun, the Earth and other planets, and life as we know it. But not all the dust was used, and what remains can be dangerous. Scientists are studying this dust with a student-designed instrument on the American space agency’s New Horizons spacecraft. The agency is busy collecting information from the spacecraft this week in the first-ever flyby of Pluto.
David James is a research assistant at the University of Colorado. Our reporter found him in one of the university’s laboratories on a recent day. He was inspecting the settings on a room-size machine.
’’That’s one of the cryopumps. You have to continuously pull air out otherwise it will leak up to the atmosphere again. ’’Those pumps take air from a tunnel or passageway. The process helps scientists make dust on Earth move as fast as it would in space. ’’We’ve even reached 107 kilometers per second is our fastest particle here. ’’The tests may help scientists learn what causes dust to be created in space. It may also help them design spacecraft and equipment that cannot be hurt by dust.
Tiffany Finley was also a graduate student when she began working on the dust counter project, in 2002. ’’This opportunity came up and I said ’What? You’re going to Pluto? I would love to be part of that.’ ’’The dust counter was designed to measure and count the dust that hit and flew by the New Horizons spacecraft as it traveled to Pluto. Tiffany Finley says such a device would usually be created by experts. She later became the manager of the dust project. Today, Ms. Finley is the Science Operations Manager for the New Horizons mission.
Mihaly Horanyi is a professor of physics at the University of Colorado. He also serves as the faculty advisor for the Student Dust Counter project. He says the counter did not cost as much money as it would have if a company built it because so many students were involved. More than 30 students have worked on the project.
The Student Dust Counter was launched with the New Horizons spacecraft in 2006. Six devices on the almost 5-billion-kilometer-long journey were designed to stay quiet during the trip. Now they are operating.They are sending color pictures back to Earth, and studying Pluto’s chemical makeup. But the Student Dust Counter has been operating throughout the trip.
20. What is the sun made of?
21. What was David James doing when the reporter found him?
22. How many students have worked on the Dust Counter project?
选项
A、More than 13.
B、More than 15.
C、More than 50.
D、More than 30.
答案
D
解析
选项都是和数字相关的,是关于多少的。题目问的是有多少学生参加了除尘项目。文中提到超过 30 个学生参加了除尘项目。由此可知,正确答案是D)。
转载请注明原文地址:https://tihaiku.com/zcyy/2912104.html
相关试题推荐
[originaltext]Isometimesthinkthatsomuchofourlifetakesplaceinside
[originaltext]W:Therewillbemoreplasticthanfishintheworldsoceansby2
[originaltext]W:Therewillbemoreplasticthanfishintheworldsoceansby2
[originaltext]W:Therewillbemoreplasticthanfishintheworldsoceansby2
[originaltext]Ihavestagefright.I’vealwayshadstagefright,andnotju
[originaltext]Ihavestagefright.I’vealwayshadstagefright,andnotju
[originaltext]ThefirsttimeArnoldSchwarzeneggerwenttotheUnitedState
[originaltext]ThefirsttimeArnoldSchwarzeneggerwenttotheUnitedState
[originaltext]ThefirsttimeArnoldSchwarzeneggerwenttotheUnitedState
[originaltext]WhenAshleyBlackmonsatdownforherjobinterviewforamar
随机试题
如果你意识到自己正在生气,那就闭上嘴,这样你就能够抑制住正在不断上升的怒气。Ifyouareconsciousofbeingangry,keep
TimePatterninAmericaA)SusanAnthonyhasaneight-to-
Air,or()iscalledatmosphere,surroundsthewholeearth.A、itB、thatC、whichD、
Thelinkbetweenhealthandincomeseemsprettyuncontroversial.【C1】______al
A.瞳孔对光反射 B.互感性对光反射 C.瞳孔调节反射 D.集合反射看近物
下列哪一项建设工程属于必须实行监理的范围?( )A.总投资在1000万元的公用
电子文件的有效性性是指电子文件的可理解性和可被利用性,包括()。A.真实性 B
2020年12月,中国新能源汽车生产销售双增长,产销双双超过20万辆,再创历史新
事实表明对坐飞机感到恐惧是没有道理的。仅在1986年一年,高速公路事故使得4.6
A.甲苯咪唑 B.伊维菌素 C.左旋咪唑 D.阿苯达唑 E.噻嘧啶具有神
最新回复
(
0
)