单项选择题

A．Two different types of bones in the human body.
B．How bones help the body move.
C．How bones continuously repair themselves.
D．The chemical composition of human bones.
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单项选择题
A．The man should try to be more understanding.B．The man’’s wife should be more understanding.C．The man’’s negative attitude may be derived from his childhood.D．The pessimism of man’’s wife may be the result of her past experiences.
A．The man should try to be more understanding.
B．The man’’s wife should be more understanding.
C．The man’’s negative attitude may be derived from his childhood.
D．The pessimism of man’’s wife may be the result of her past experiences.
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