托雅拓展阅读第六期.docx

Passage1 研究表明，月球岩石中的水资源比地球水资源包含更多的重氢元素，意即月球水有可能来源于彗星。克里斯托弗英塔格里塔报道。 The?Apollo?moon?missions?ended?almost?40?yearsago.?But?for?lunar?scientists,?theyre?gifts?that?keepon?giving.?Researchers?studying?rocks?brought?backby?astronauts?have?found?that?the?moon’s?scarce?water?has?a?different?chemical?signaturethan?Earth?water.?Which?leads?to?the?conclusion?that?the?water?probably?came?from?comets.The?study?appears?in?the?journal?Nature?Geoscience. [James?Greenwood?et?al., Hydrogenisotope?ratios?in?lunar?rocks?indicate?delivery?of?cometary?water?to?the?Moon] The?researchers?used?what’s?called?an?ion?microscope?to?compare?the?amount?of?normalhydrogen?in?the?moon?rocks?to?the?amount?of?the?hydrogen?isotope?deuterium,?whichcarries?an?extra?neutron.?They?found?deuterium?at?higher?levels?than?its?found?in?Earth?water—but?at?levels?similar?to?the?comets?Hale-Bopp,?Hyakutake?and?Halley.?Which?suggests?cometsdeposited?water?on?the?ancient?moon,?shortly?after?its?formation?four-and-a-half?billion?yearsago. The?finding?could?also?explain?a?mystery?of?water?on?Earth—how?the?oceans?got?here.?Becauseif?comets?battered?the?moon,?they?probably?hit?the?Earth,?too.?Ocean?water?does?have?moredeuterium?than?water?in?the?Earths?mantle.?Maybe,?the?researchers?say,?thats?because?theoceans?have?an?extra?dose?of?melted?comet?ice. —Christopher?Intagliata 虽然阿波罗登月计划在40年前就已经结束，但对于月球科学家来说，它依然在不断揭开月球的神秘面纱。通过研究宇航员从月球上带回来的岩石标本，科学家们发现月球上稀少的水资源与地球水资源的化学成分并不相符。因此他们认为月球水很可能来源于宇宙彗星。该项研究发表在地球科学综合杂志上（詹姆斯格林伍德及多人《月球岩石标本中的氢同位素比例显示月球水来自彗星》）。 研究人员利用离子显微镜对月球岩石标本中正常氢元素（包含1个中子）与重氢元素（包含2个中子）的含量进行了比较。数据显示月球水比地球水包含更多的重氢元素，并与海尔波普彗星、百武彗星及哈雷彗星更为接近。该结果表明在45亿年前古月球刚成型不久，就有彗星造访并留下了水资源。 此研究同时也解释了有关地球水资源的一个谜题——海洋是如何形成的。如果彗星撞击过月球，那它们也很可能撞击过地球：海水确实比地幔中的水含有更多重氢元素。科学家们也表示这可能是因为海水中含有更多的融化掉的彗星冰层。 Passage 2 澳大利亚的雄性华丽细尾鹪鹩总是在捕食者的警告叫声后发出回应叫声，而雌性鹪鹩则对这种接连发出的声音特别敏感。CG报道。 It’s?one?of?the?oldest?movesin?teen?dating.?Head?to?ascary?movie.?As?soon?asthe?scary?music?kick?in,?your?date?cuddles?closer?for?comfort.?Well,some?birds?may?have?the?same?id