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
It was not "the comet of the century" experts predicted it might be. However, Kohoutek has pro- vided a bonanza of scientifi
It was not "the comet of the century" experts predicted it might be. However, Kohoutek has pro- vided a bonanza of scientifi
admin
2010-06-30
69
问题
It was not "the comet of the century" experts predicted it might be. However, Kohoutek has pro- vided a bonanza of scientific information. It was first spotted 370 million miles from Earth, by an astronomer who was searching the sky for asteroids, and after whom the comet was named. Scientists who tracked Kohoutek the ten months before it passed the Earth predicted the comet would be a brilliant spectacle. But Kohoutek fell short of these predictions, disappointing millions of amateur sky watchers, when it proved too pale to be seen with the unaided eye. Researchers were very happy nonetheless With the new information they were able to glean from their investigation of the comet. Perhaps the most significant discovery was the identification of two important chemical compounds — methyl cyanide and hydrogen cyanide — never before seen in comets, but found it the far reaches of interstellar space. This discovery revealed new clues about the origin of comets. Most astronomers agree that comets are primordial remnants from the formation of the solar system, but whether they were born between Jupiter and Neptune or much farther out toward interstellar space has been the subject of :much debate. If compounds no more complex than ammonia and methane, key components of Jupiter, were seen in comets, it would suggest that comets form within the planetary orbits. But more complex compounds, such as the methyl cyanide found in Kohoutek, point to formation far beyond the planets; there the deep freeze of space has kept them unchanged.
What is the main topic of the passage?
选项
A、What was learned from Kohoutek?
B、What was disappointing about Kohoutek?
C、Where Kohoutek was spotted?
D、How Kohoutek was tracked?
答案
A
解析
谈论的要点不是慧星一百年经过地球一次的奇观,而是科学家们从kohoutek上获得的信息,以此来证明慧星的产生地点。故应选A。
转载请注明原文地址:https://www.kaotiyun.com/show/N9Jd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Themostobviouspurposeofadvertisingistoinformtheconsumerofavailableproductsorservices.Thesecond【C1】______istos
Payandproductivity,itisgenerallyassumed,shouldberelated.Buttherelationshipseemstoweaken【C1】______peoplegetolder
Atthedawnofthe20thcentury,suburbiawasadreaminspiredbyrevulsiontothepovertyandcrowdingofthecities.Inthevi
Therewasatimeinthelate17thcenturywhennorespectablemonarchwouldbeseenwithoutaguitar.BothLouisXIVandCharle
AnswerQuestions71to80byreferringtothebriefsonfourfamouscastlesinWales,Britainonthefollowingpage.Answereach
AnswerQuestions71to80byreferringtothebriefsonfourfamouscastlesinWales,Britainonthefollowingpage.Answereach
Youhavereadanarticleinanewspaperwhichstatesthat"Childrenshouldbepaidfordoinghousework,forthishelpsthemtol
Inpopulardiscussionsofemissions-rightstradingsystems,itiscommontomistakethesmokestacksforthetrees.Forexample,
shoplifting
WhatisthemainpartoftheGoldenGateBridge?
随机试题
男性患儿,8岁。因发热,头痛,皮疹3天入院。查体:急性病容,皮疹出现于躯干、头面部、四肢近端。可见红斑疹、丘疹、疱疹、脓疱疹不同形态的皮疹,个别皮疹已结痂。血象:白细胞总数为4.2×109/L。患儿同学中有类似的病人。相关疾病的防治措施正确的是
下列关于F68说法正确的是
女性,45岁,因消瘦、乏力、下腹部发现包块2个月,腹胀2周就诊,消瘦,腹部移动性浊音(+)。妇科检查:子宫正常大,右侧有12cm×8cm×6cm不规则肿块,尚活动,后穹隆扪及少许结节,质硬。首选的辅助检查为
某高层商业综合楼地上共10层、地下共3层,建筑高度53.80m,总建筑面积67134.48m2。其中:地下部分建筑面积27922.30m2,使用性质为停车库及设备用房,共计停车415辆;地上部分建筑面积39215.18m2,地上1~5层使用性质为零售商业,
有关统计表明,目前我国对进口石油的依赖程度已超过50%。不少专家认为,将淀粉质植物(如:粮食、薯类、作物秸秆等)加工成乙醇、生物柴油、生物氢等,用做生产和生活能源,是我国未来能源的希望所在。回答问题。我国发展生物能源的好处不包括()。
下列选项中,属于专制君主直接进行地方监察的机构是()
病理性象征性思维
(2001年试题,七)设函数f(x),g(x)满足f’(x)=g(x),g’(x)=2ex一f(x),且f(0)=0,g(0)=2,求
PAL制式的VCD影片采用的视频压缩编码标准是(48),其图像分辨率为(49),配音的压缩编码采用(50)。DVD影片采用的视频压缩标准是(51)。
以下关于菜单的叙述中,错误的是
最新回复
(
0
)