The first animals on this living sphere, the Earth, were primitive______animals, and then around 500 million years ago these sea

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问题 The first animals on this living sphere, the Earth, were primitive______animals, and then around 500 million years ago these sea animals developed shells.

选项 A、versatile
B、marine
C、redatory
D、feasible

答案B

解析句子大意为：地球上的首批动物是原始海洋动物，然后在大约500万年前这些海洋动物进化出了身上的壳儿状物。句子后半句提到“这些海洋动物”，可知空中应该也是同样意思，四个选项中只有选项B是“海洋的”之意。

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考博英语

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The first animals on this living sphere, the Earth, were primitive______animals, and then around 500 million years ago these sea

考博英语

AskanAmericanschoolchildwhatheorsheislearninginschoolthesedaysandyoumightevengetareply,providedyouaskit

To______Americandollarsintoforeigncurrency,multiplytheamountbytherateofexchange.

Wehadto______alotofnoisewhenthechildrenwereathome.

Pricesdeterminehowresourcesaretobeused.Theyarealsothemeansbywhichproductsandservicesthatareinlimitedsupply

Debbieisadivorceewholiveswithherchildren.Sheworksinadoctor’sofficeandenjoysthecontactwithpeople.Herson,J

Theconceptofbiodiversityencompassesseveraldifferentlevelsofbiologicalorganization,fromtheveryspecifictothemost

PublicationofthissurveyhadoriginallybeenintendedtocoincidewiththeannualmeetingsoftheWorldBankandtheInternati

Theroleofgovernmentinenvironmentalmanagementisdifficultbutinescapable.Sometimes,thestatetriestomanagetheresour

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