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．He sent surgeons to serve in the army.B．He provided soldiers with medical supplies.C．He recruited volunteers to care for the wounded.D．He helped to flee the prisoners of war.
A．He sent surgeons to serve in the army.
B．He provided soldiers with medical supplies.
C．He recruited volunteers to care for the wounded.
D．He helped to flee the prisoners of war.
单项选择题
A．To improve the study skills of university students.B．To suggest changes in the student government.C．To give people the opportunity to speak with a politician.D．To discuss graduation requirements for political science majors.
A．To improve the study skills of university students.
B．To suggest changes in the student government.
C．To give people the opportunity to speak with a politician.
D．To discuss graduation requirements for political science majors.
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