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
Thousands of years.
Thousands of years.
admin
2016-11-25
22
问题
Earth is one of nine planets which revolve (绕转) around the sun. This family of planets, with their moons, is known as the solar system. Since we live on Earth, we think it is the most important planet. But the other planets are also interesting. Some are smaller than Earth, some larger;some are hotter, some colder. Each one is different from all the others and has something special about it. No one knows for certain how the solar system began. We do know a lot about the planets, however, from the science of astronomy (天文学 ). Astronomers have done research on the planets and other objects in space for thousands of years. Astronomy is a very complicated science. We look at the other planets to study them, but the planet we are on is moving all the time. Computers have helped us in the past twenty or thirty years. The satellites we sent into space to measure and take pictures also tell a lot about the planets and help us to understand them.
Mercury (水星) is the closest planet to the sun. It is also the smallest and fastest planet. The speed of the planet gave it its name: Mercury was the rapid messenger of the Roman gods. Mercury completes its orbit around the sun in only 88 days, while Earth’s orbit takes 365.25 days. A day on Mercury, however, is much longer than a day on Earth. Earth rotates on its axis once every 24 hours. Mercury rotates on its axis once every 59 days.
Venus (金星) is the second planet in distance from the sun. It is about the same size as Earth, and it comes closer to Earth than any other planets. Next to the sun and the moon, Venus is the easiest object in the sky to see. People of ancient times loved its brightness and beauty so much that they named it after the Roman goddess of love and beauty.
Venus revolves around the sun once every 225 days and rotates on its axis once every 224 days. Information from telescopes and satellites shows us that the planet is very hot. The temperature is usually between 300 and 675 degrees Celsius. We can observe both Venus and Mercury either in the evening or early in the morning just before the sun rises.
Mars( 火星) is called the red planet because of its definite (明确的) red-orange color. It is the fourth farthest planet from the sun. A day on Mars is only about 40 minutes longer than a day on Earth, but a year lasts 687 days. The planet was named after the Roman god of war.
For many years, people believed that there was life on Mars, but we now know that there probably isn’t. The Mariner space program sent many satellites to Mars. We have excellent photos and information on this neighbor planet, and nothing suggests that there is any life there.
The fifth planet from the sun is also the largest of all the planets, Jupiter (木星). Jupiter revolves around the sun once every 12 years, yet its day is amazingly(惊人地) short. Its rotation, or its day, is only about 10 hours long. This is the fastest rotation—the shortest day—of any of the planets.
The planet’s name is appropriate, since Jupiter was the largest Roman god—the king of all the other gods. If you can imagine Jupiter as a hollow ball, all of the other planets would fit inside and there would still be a lot of room left. Jupiter has fourteen moons, the largest number of any planets.
选项
答案
Thousands of years.
解析
转载请注明原文地址:https://kaotiyun.com/show/16Wd777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
WhichistheattitudeofthetelevisionindustrytowardsthedigitalFIDTV?
WhichofthefollowingsustainabilityprogramsisNOTmentionedinWal-Mart’sreport?
Thingsmustbegoingwellintheparcelsbusiness.Consumersandcompaniescontinuetoflockindrovestotheinternettobuyan
______isnotforboys?______hasagoodreputationforwhattheydoforsomespecialpersons?
WhatwasSteve’sattitudetowardswomenwhowrotelovestories?WhatwereHelen’sfeelingsaboutthemovefromLondontoStrett
Grown-ups,asanychildwilltellyou,aremonstroushypocrites,especiallywhenitcomestotelevision.Itistotaketheirmin
Accordingtotheauthor,anation’swealthdependsupon______.Theword"foremost"mostprobablymeans______.
Agoodbookmaydrawourattentionsocompletelythatweforgetoursurroundingsandevenouridentityforthetimebeing.
Allthatfault-findingaboutloweringcholesterolandeatinglessfatmustfinallybepayingoff.Accordingtoastudypublished
Afterathree-yearsurveyofthesocialandbehavioralsciences,acommitteeoftheNRChasconcludedthatthesesciencesarelo
随机试题
与发货单相比,提货单的格式可以省略()
患者,女,36岁。漏下不止,血色暗淡,四肢不温,面色萎黄,舌淡苔白,脉沉细。治疗应首选()
下列有关木材的力学性能的叙述,正确的是()。I.木材顺纹受拉破坏前变形很小,没有显著的塑性变形,属于脆性破坏;Ⅱ.木材顺纹受压破坏前有明显的塑性阶段,属于塑性破坏;Ⅲ.木材结构通常多为顺纹受剪,木材的抵抗力很大;Ⅳ.木材在顺纹受拉破坏前有明显的塑
1995年11月,国务院确定,从1996年开始用5年时间完成全国陆地(不含港澳界)省、县两级陆地行政区域界线的勘定任务。根据这一要求,某省在民政部门的牵头组织下,于2000年4月开始对本省的县级行政区域界线进行勘定工作。问题:简述界桩的形状及界桩点的
施工职业健康安全管理体系中,一般从()层次进行合规性评价。
《中华人民共和国劳动法》规定,新建、改建、扩建工程的劳动安全卫生设施必须与主体工程()。
会计凭证分为几个部分?分别包括哪些内容?
下列借款利息项目中,不可以从外商投资企业应纳税所得额中扣除的有()。
警察是具有武装性质的维护社会秩序、惩治犯罪、保卫国家安全的()。
Thelocalfarmerssufferedheavydamagebecauseoftheflood.
最新回复
(
0
)