Many people believe that our species ______ threatened with extinction.

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问题 Many people believe that our species ______ threatened with extinction.

选项 A、is
B、are
C、are to be
D、used to be

答案A

解析主谓一致题。species是复数形式表示单数意义，谓语动词用单数，并且主句用的时态是一般现在时，故从句也用一般现在时，故选A 。

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专业英语四级

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Many people believe that our species ______ threatened with extinction.

专业英语四级

Whatisthespeaker?

Nowadaysgroupsofscientificworkers,often【C1】bytheirgovernments,spendtheirtime【C2】theoccurrenceofearthq

Nowadaysgroupsofscientificworkers,often【C1】bytheirgovernments,spendtheirtime【C2】theoccurrenceofearthq

IsContinuingEdforYou?Continuingeducationisimportantforeveryonenow,inallfields.Almostassoonasyou’vecomp

Inthearmyageneralisofamuchhigher______thanacaptain.

Inrecentdecadeschildspecialistshavetriedmoreandmoretohelpparentswiththeirchildren’sschoolbehavior,Schoolsofe

Yesterday’sstrikecausedthemostconfusionfor

Yesterday’sstrikecausedthemostconfusionfor

Onereasonhumanbeingscanthriveinallkindsofclimatesisthattheycancontrolthequalitiesoftheairintheenclosedsp

OnedaywhenIwashavingaheartylunchatafast-foodrestaurant,anoldcoupleentered.They【C1】______amealatthecount

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