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．A lecture in their American literature course.B．A film about the American frontier.C．A book they both read.D．The woman’’s recent trip to the American Midwest.
A．A lecture in their American literature course.
B．A film about the American frontier.
C．A book they both read.
D．The woman’’s recent trip to the American Midwest.
单项选择题
A．It limited their supply of food.B．It killed many baby bald eagles.C．It destroyed many of their nests.D．It made their eggshells too fragile.
A．It limited their supply of food.
B．It killed many baby bald eagles.
C．It destroyed many of their nests.
D．It made their eggshells too fragile.
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