首页
登录
职称英语
Comets do not give off their own light but reflect light from other sources, suc
Comets do not give off their own light but reflect light from other sources, suc
游客
2024-01-13
48
管理
问题
Comets do not give off their own light but reflect light from other sources, such as the Sun. Scientists estimate the mass of comets by their brightness: the greater a comet’s mass, the more light that comet will reflect. A satellite probe, however, has revealed that the material of which Hal-ley’s comet is composed reflects 60 times less light per unit of mass than had been previously thought. The statements above, if true, give the most support to which one of the following?
选项
A、Some comets are composed of material that reflects 60 times more light per unit of mass than the material of which Hal ley’s comet is composed.
B、Previous estimates of the mass of Halley’s comet which were based on its brightness were too low.
C、The total amount of light reflected from Halley’s comet is less than scientists had previously thought.
D、The reflective properties of the material of which comets arc composed vary considerably from comet to comet.
E、Scientists need more information before they can make a good estimate of the mass of Halley’s comet.
答案
B
解析
由题中的论述可知彗星的质量与它们反射的光的多少成比例,当发现单位质量的哈雷彗星的材料实际反射光的强度比以前认为的值低60倍时,在亮度不变的条件下,就可推出目前根据光的强度估算的哈雷彗星的质量就比以前估算的高得多,也就是说以前基于亮度对哈雷彗星的质量的估计太低,所以(B)为正确答案;选项(C)是明显错误的,因为哈雷彗星反射的光的总量是可以被科学家们实际测到的,它是科学家们对彗星质量进行估计的出发点,因此它的值几乎是不变的。(A)、(D)和(E)三选项都不能从段落中合理地推出。
转载请注明原文地址:https://tihaiku.com/zcyy/3358794.html
相关试题推荐
Howcanwegetridofgarbage(垃圾)?Dowehaveenoughenergysourcestomeeto
Howcanwegetridofgarbage(垃圾)?Dowehaveenoughenergysourcestomeeto
Howcanwegetridofgarbage(垃圾)?Dowehaveenoughenergysourcestomeeto
Howcanwegetridofgarbage?Dowehaveenoughenergysourcestomeetour
Howcanwegetridofgarbage?Dowehaveenoughenergysourcestomeetour
ThereflectivetowersofNewYorkCity,whichisontheAtlanticmigrating(
ThereflectivetowersofNewYorkCity,whichisontheAtlanticmigrating(
ThereflectivetowersofNewYorkCity,whichisontheAtlanticmigrating(
ThereflectivetowersofNewYorkCity,whichisontheAtlanticmigrating(
ThereflectivetowersofNewYorkCity,whichisontheAtlanticmigrating(
随机试题
与2001年相比,2007年工业地价增长率提高了:() A.8倍 B.3
()既是居住小区的主要技术经济指标,也是民用建筑的主要技术经济指标。A.建筑
水泵气穴和气蚀的危害主要是:产生噪声和振动,引起( ),材料的破坏,缩短水泵使
急进性肾小球炎I型患者血浓度常升高的抗体是:A.抗肾小球基底膜抗体 B.抗核抗
某单位初次申请测绘资质,按照《测绘资质管理规定》,下列专业范围中,可以受理甲级测
某宗房地产的收益期限为8年,未来第一年的有效毛收入为80万元,运营费用为45万元
(2015年5月)提高绩效面谈质量必须采取有效的信息反馈方式,并且使其具有针对性
人民代表大会制度是 A.中国人民当家作主的重要途径 B.中国人民当家作主的最
符合白细胞吞噬作用的描述是A.IgG和C3b增强白细胞吞噬活性 B.活性氧代
(2016年真题)某女,42岁。经血淋漓不断月余,气短懒言,倦怠乏力,面色苍白。
最新回复
(
0
)