Why didn’t people begin to use unmanned vehicles in undersea exploration until r

游客2023-10-06 78

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

Fewpeoplecan______themorningexerciseseveryday.A、insisttoB、goonC、wipe

Peoplegenerallycalleachotherbytheir(11)muchsoonerintheiracquaintance

Peoplegenerallycalleachotherbytheir(11)muchsoonerintheiracquaintance

TheRedCrossisaninternationalorganizationwhichcaresforpeoplewhoare

Themiddlepartofthe20thcenturybroughtnewwaystohelppeoplegetoverdis

Thepassagestatesthatpeoplefromvariouscultures______.[br]Generallyhost

Thepassagestatesthatpeoplefromvariouscultures______.[br]Accordingtot

Thepassagestatesthatpeoplefromvariouscultures______.[br]Inthethirds

Georgeisoneofthosepeoplewho______troubleinworkingoutthisproblem.A、h

Whenpeoplebecomegoodatdoingthethingstheyliketheyfindthemselves.

Themysterioustigerhasbeenasymbolofpowerandstrengthforcenturies.

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Nora:You’relate.Nowwe’llmissthemovie.Alex:______Iwasstuckintraffic

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放散热量的房间，自然通风时仅考虑()。A.热压 B.风压 C.高度 D

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藏族同胞喜饮（）。A.酥油茶 B.奶茶 C.甜茶 D.青稞酒 E.米酒

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