单项选择题

From the passage we know that joints and muscles perform best when ()

A. they are twisted and stretched
B. they are in their normal positions
C. they are tested with a human "guinea pig"
D. they are tested with electronic instruments

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单项选择题

22()

A.shifting
B.transferring
C.altering
D.transforming

单项选择题

Who runs the coffee café()

A. A high school.
B. Students in a high school.
C. Teachers in a high school.
D. A business company.