Ultrasonic devices were used to_________.

Ultrasonic devices were used to_________.

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If snow and ice covered areas begin melting,________.

If snow and ice covered areas begin melting,________.

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According to the passage ,what is the main difference betwee

According to the passage ,what is the main difference between ritual and drama?A

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Antarctica is colder than Arctic on average.

Antarctica is colder than Arctic on average.A.True B.False C.Not Given

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