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] Why is ocean exploration not so expensive as space travel?
Because ______ for submersibles to get away from the Earth’s gravity.

选项

答案 there’s no need

解析

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

因为人们有各自不同的兴趣和爱好，所以他们所喜欢的电视节目也各不相同。Since/Aspeoplehavedifferentinterestsand

Peoplehaveattemptedtosimulatehumanvoicesinmachinesforquitesometi

Peoplehaveattemptedtosimulatehumanvoicesinmachinesforquitesometi

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The______physicisthasbeenchallengedbymanypeopleinhisfield.A、respected

Moreandmorepeoplearebecomingawareofthedangersfacingourplanet.______

Peoplesayhewasacold______man,amurdererwhoshouldhavebeenexecuted.A、ac

Thepeoplearoundhimkeptsaying______thedrownedmanbuthewentondoingar

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