首页
登录
职称英语
Astronomers who study planet formation once believed that comets—because the
Astronomers who study planet formation once believed that comets—because the
游客
2024-01-10
44
管理
问题
Astronomers who study planet formation once believed that comets—because they remain mostly in the distant Oort cloud, where temperatures are close to absolute zero—must be pristine relics of the material that formed the outer planets. The conceptual shift away from seeing comets as pristine relics began in the 1970s, when laboratory simulations revealed there was sufficient ultraviolet radiation reaching comets to darken their surfaces and there were sufficient cosmic rays to alter chemical bonds or even molecular structure near the surface. Nevertheless, astronomers still believed that when a comet approached the Sun—where they could study it—the Sun’s intense heat would remove the corrupted surface layer, exposing the interior. About the same time, though, scientists realized comets might contain decaying radioactive isotopes that could have warmed cometary interiors to temperatures that caused the interiors to evolve. [br] It can be inferred that the author would agree with which of the following statements about the "laboratory simulations"?
选项
A、The simulations showed that despite the low temperatures in the Oort cloud, there was sufficient energy there to alter the comet.
B、Astronomers were initially reluctant to accept what the simulation showed about the composition of comets.
C、The simulations themselves did not eliminate the possibility that comets contain pristine relics of material from the early solar system.
答案
A,C
解析
第二句的实验想要表明的是:即使奥尔特星云是绝对零度,紫外射线等依然可以让彗星不纯,因此选项A正确。C项第二句只能表明彗星的表面不纯,但是内部依然有可能是纯的,因此选项C正确。B项第三句天文学家其实承认了第二句彗星不纯的理由。
转载请注明原文地址:https://tihaiku.com/zcyy/3349655.html
相关试题推荐
Johnwishedtobecomea(n)______becausehewasinterestedinlearningaboutanci
Becausethecongresswomanhasbeensoopenhandedwithmanyofherconstituents,
Thewritercametobelabeled______becausesheisolatedherselfinherapartment
OneofthecharactersinMiltonMurayama’snovelisconsidered______becausehed
Becausepostmodernistcriticsoftenrelyon(i)______language,theirprosefrequ
Becauselittlerainfallsinthedistrictduringsummer,municipalitiesarenece
Theman’scolleaguescharacterizedhimas______[because]hehasanirritable,qu
Becauseofthe______effectsofthehotsprings,touristssufferingfromvarious
Victorgainedareputationforbeinga______becauseheconstantlybulliedother
Malabasedhernewonlinebusinessinthe______,becauseshewantedtoworkfar
随机试题
Tocelebratethenationalday,therewasa____fireworksdisplay.A、specificB、spe
Inwhatnowseemsliketheprehistorictimesofcomputerhistory,theearly
Thedailyrateforahotelroomthatsleeps4peopleis$39foronepersonand
Lookatthefollowingcartoonandwriteanarticle,whichshouldmeetthefollow
构成体制的基本要素是()A.是否有一支统一指挥的军队 B.是否有高度形式化的协
装修装饰工程质量管理中实施ISO9000标准的意义()。A.通过实施质量认证可
对行政立法监督认识错误的是( )。A.全国人大常委会有权撤销与法律相抵触的行政
关于小肠的描述,错误的是A.十二指肠是小肠第一部分 B.空肠位于左上腹 C.
金融市场的特点包括( )。A.市场商品的特殊性 B.市场交易价格的一致性
机电工程项目索赔的合同依据的分类有( )。A.合同内索赔 B.合同外索赔
最新回复
(
0
)