单项选择题

A．She felt proud.
B．She felt delighted.
C．She felt satisfied.
D．She felt surprised.
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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.
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.
填空题
According to the scientists at Hawaii’s Mauna Loa Observatory, the average CO2 levels increased by ______in 2003.
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