Why didn’t people begin to use unmanned vehicles in undersea exploration until recently? It is because of the ______. What doe

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问题 Why didn’t people begin to use unmanned vehicles in undersea exploration until recently?
It is because of the ______.

What does the author mean by saying "more challenging" in the last paragraph?

选项

答案More demanding

解析

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本试题收录于：大学英语三级B级题库大学英语三级分类

大学英语三级B级

大学英语三级

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Why didn’t people begin to use unmanned vehicles in undersea exploration until recently? It is because of the ______. What doe

大学英语三级B级

大学英语三级

Doctorsarebecoming______aboutthehealthofchildrenspendinghourafterhour______computergameswhoareexposingthemsel

Interviewer:Mostpeoplelovethecircus.Areyoureadyfortomorrowafternoon’sperformance?Circusleader:We’llbeworkinga

Peoplecarryoutmuchoftheircommercehere,______sellingvegetables,servinglocalsmealsorrunning,ahairsalon.

Inthepast,mostcitiesusuallywerethenaturaloutgrowthofvillagesandtownsthathappenedtoprosper.Romestartedoutas

Therewasatimeinthe1960’sand1970’swhensomepeoplebelievedthatcoffeewouldreplaceteaasBritain’sfavoritebeverage

Mysonhasanadvantageoverhismother______hecanspeakEnglish.

A、Salesmanandcustomer.B、Policemananddriver.C、Doctorandpatient.D、Teacherandstudent.C

IrememberatripIoncemadetomygrandmother’shouse.Shelivedatabout30kilometresawayfromusandweusedto

WhenColumbusreachedtheNewWorld,comwasthe________intheAmerica.

______the1990’sthatthetradebetweenthetwocountriesreacheditshighestpoint.

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消渴病变的脏腑以哪一脏最为关键

A、广金钱草B、穿心莲C、草麻黄D、广藿香E、槲寄生茎呈方柱形，多分枝，节稍膨大

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下列各项中，会使固定资产账面价值发生变化的是（ ）。

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下列各项中，会使固定资产账面价值发生变化的是（　　）。