单项选择题

A．A long poetry of Middle Ages.
B．A medieval novel.
C．A medieval document.
D．An old medieval romance.
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单项选择题
A．They defend the bone against viruses.B．They prevent oxygen from entering the bone.C．They break down bone tissue.D．They connect the bone to muscle tissue.
A．They defend the bone against viruses.
B．They prevent oxygen from entering the bone.
C．They break down bone tissue.
D．They connect the bone to muscle tissue.
单项选择题
A．A victim.B．A police detective.C．A robber.D．A pet bird.
A．A victim.
B．A police detective.
C．A robber.
D．A pet bird.
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