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

游客2024-07-24 10

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

Mostparentsandteachersdonotlikeyoungpeopletoreadcomicbooks(连环画),

Mostparentsandteachersdonotlikeyoungpeopletoreadcomicbooks(连环画),

Mostparentsandteachersdonotlikeyoungpeopletoreadcomicbooks(连环画),

VisitorstotheUnitedStatespossiblyfeelthatcitypeopleofthecountryare

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Inthecourseofhistory,people______(send)messagesinmanydifferentways.ha

Thoughpeopleplantmanytreesinthisareaeveryyear,thetopofsomehillsis

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[originaltext]Wouldyoulikesomemorerice?[/originaltext]A、Ilikericebest.

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