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

Themostwidespreadfallacyofallisthatcoldsarecausedbycold.Theyareactuallycausedbyvirusespassingonfromperson

Millionsofpeoplediedinthe14thcenturyastheresultofa(an)______knownastheBlackDeath.

Americanstodaydon’tplaceaveryhighvalueonintellectOurheroesareathletes,entertainers,andentrepreneurs,notscholar

______isthequestionofusingexistingresourcestoproduceoriginalandbeneficialsolutions,ideasorproducts.

ThegeneralmaterialDNAcontainscodedinformationforthesynthesisofproteins.

Bythe1980s,accordingtointernationalbutadmittedlyinconsistentdefinitionsofliteracy,aboutsevenoutoftenadultsint

Lovecan’tconquerall.So,beforecouplestietheknot,theyshouldknowwhatthey’regettinginto.Thetabooagainstcouplesl

KevinRogersusedtobemyboss.Atthattimehewasahardworking,up-and-comingbusinessmanandarealslave-driver,alwayst

Severaltrialeffortsinthe1980sprovedthatitwasfinancially______torestoreoldbuildings.

近年来，全国医疗卫生行业作风建设的成果得到体现的情况是

A．竞争性抑制B．非竞争性抑制C．反竞争性抑制D．不可逆性抑制E．以上均正确抑制剂与酶活性中心上的必需基团以共价键结合，属于

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