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

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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 ______.
[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.

Thesealaylikeanunbrokenmirrorallaroundthepine-girt,lonelyshoreso

根据《营业性演出管理条例》规定,演员不得以假唱欺骗观众，演出举办单位不得组织演员

净是戏曲表演行当之一，它是指（）A.群众角色 B.花脸 C.喜剧角色 D.

毕Ⅱ式胃大部切除术后，上腹剧烈疼痛，呕吐频繁、量少，不含胆汁。最可能的并发症是A

某班主任每月在班上开展一次“道德模范”评选活动，由全班投票，选出品德优秀的学生，

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人在每一瞬间，将心理活动选择了某些对象而忽略了另一些对象。这一特点指的是注意的（

期货合约中设置最小变动价位的目的是()。A.保证市场运营的稳定性 B.保证市场

府城房地产开发公司为内资企业，公司于2016年1月－2019年12