单项选择题

A．constitutes
B．constitute
C．comprises
D．comprise
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单项选择题
A．datumB．figuresC．numbersD．pictures
A．datum
B．figures
C．numbers
D．pictures
单项选择题
Why do pet dogs love performing tricks for their masters
A．To avoid being punished.
B．To show their affection for their masters.
C．To win leadership of the dog pack.
D．To show their willingness to obey.
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