首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in【C1】______at the Sun’s ver
A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in【C1】______at the Sun’s ver
admin
2010-07-24
42
问题
A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in【C1】______at the Sun’s very center. It is here that is to be found the【C2】______of the energy that the Sun pours out into space is【C3】______The energy takes the form of light and heat. This energy is【C4】______at the center of the Sun as billions【C5】______billions of nuclei of hydrogen atoms【C6】______with each other and fuse together to form nuclei of helium, and in doing so,【C7】______some of the energy that is【C8】______in the nuclei of atoms. The【C9】______of light and heat of the Sun【C10】______that some 600 million tons of hydrogen be【C11】______into helium(氦)in the Sun every second. This the Sun has been doing for several thousands of millions of years. The nuclear energy is released at the Sun’s center as high-energy gamma radiation,【C12】______of electromagnetic radiation like light and radio waves, only of very much shorter【C13】______. This gamma radiation is absorbed by atoms inside the Sun to be【C14】______at slightly longer wavelengths. This radiation, in its【C15】______is absorbed and reemitted. As the energy filters through the【C16】______of the solar interior, it passes through the X-ray part of the spectrum【C17】______becoming light. At this stage, it has reached what we call the solar surface, and can escape into space without being absorbed further by solar atoms. A very small【C18】______of the Sun’s light and heat is emitted in such directions that【C19】______passing unhindered through interplanetary space, it【C20】______the Earth.
【C13】
选项
A、pace
B、wavelength
C、frequency
D、rate
答案
B
解析
名词辨义题。该处意在表明:作为电磁射线的一种,伽马射线与光波和无线电波类似,但是只是在……上略短。通过常理可判断应该是在波长上。故应选择wavelength。pace意为“步调,步法”,与射线无关;frequency意为“频率”,频率不论长短.而论快慢;rate意为“比率,等级”.亦不能用short来形容,可说small rate。
转载请注明原文地址:https://kaotiyun.com/show/RdN7777K
0
大学英语四级
相关试题推荐
____________(最好的减肥方法)istoreducethenumberofcaloriesbeingeatenandtoincreasethelevelofphysicalactivity.
A、Naturehaschangedourenvironmentovertheyears.B、Wemustavoidwastingresourcesandpollutingourenvironment.C、Ourreso
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchangesthatyoungadultsexperience.Andtheyalsoneed
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchangesthatyoungadultsexperience.Andtheyalsoneed
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchangesthatyoungadultsexperience.Andtheyalsoneed
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchangesthatyoungadultsexperience.Andtheyalsoneed
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchangesthatyoungadultsexperience.Andtheyalsoneed
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchangesthatyoungadultsexperience.Andtheyalsoneed
随机试题
人性是自私的。
下列有关《德国民法典》的表述,哪些是错误的?()
(2017年)反馈控制的实质是()
在网络计划中,工作的最早开始时间应为其所有紧前工作( )。
施工现场的加油站、油库,应遵守下列规定()。
某企业对销售员的全年考评中,年中考评成绩和年末考评成绩分别占20%和30%,销售业绩占50%。销售员甲和乙的全年销售业绩相同,甲的年中考评成绩比乙高3分,乙的全年考评成绩比甲高3分。则乙的年末考评成绩比甲高多少分?()
阐述公共选择理论关于政府失灵原因的分析。
下列关于数据仓库的叙述中,哪一个是不正确的?
A、 B、 C、 C
A、Evolutionofmonarchbutterflies.B、Livinghabitsofmonarchbutterflies.C、Migrationpatternsofmonarchbutterflies.D、Envir
最新回复
(
0
)