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

游客2023-10-08 62

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

Somepeoplegetused______anditishardforthemtostop.A、tosmokeB、tosmok

Friendshipisbothasourceof(11)andgoodhealth.Peoplewhohaveclosefrien

Withthesteadyincreaseintheamountofleisuretimethatpeopleenjoytoda

Withthesteadyincreaseintheamountofleisuretimethatpeopleenjoytoda

Withthesteadyincreaseintheamountofleisuretimethatpeopleenjoytoda

Withthesteadyincreaseintheamountofleisuretimethatpeopleenjoytoda

Inoldtimes,peoplewonderedaboutthechangesofseasons,aboutthestars,

Themainideaofthispassageis______.[br]Peoplewentbacktothecountrysid

Themainideaofthispassageis______.[br]Twohundredyearsago,peoplemove

Intheeighteenthcentury,citiesbecamelargerandlarger.Peoplemovedfrom

洛阳是地处中原的河南省西部一个地级市。它东部毗邻省会郑州，南接南阳，西连三门峡，北邻济源。在唐代，洛阳是东都，即东部都城，其人口最多的时候有100万左右

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