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.
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单项选择题
A．For they are not hard-working.B．For they don’’t have good memories.C．For they haven’’t enough time for it.D．For they are busy with their own language.
A．For they are not hard-working.
B．For they don’’t have good memories.
C．For they haven’’t enough time for it.
D．For they are busy with their own language.
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