单项选择题

The speed of an object moving in a ______ direction is called the velocity.

A. unique
B. special
C. particular
D. strange
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The progress of science depends largely on the interactions within the scientific ______.
A. community
B. neighborhood
C. federation
D. integration
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Experts offer health ______ as kids will be returning to the classroom this week.
A. slips
B. tips
C. gossips
D. clips
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