儿童发生维生素D和钙缺乏会导致（）。
参考答案：佝偻病
28. ____, he sometimes makes mistakes.
A．Though he is careful teacher
B．As he is careful
C．A careful teacher as he is
D．Being a careful teacher
每一个公民都要增强爱军拥军意识，正如（）指出的：“军民团结如一人，试看天下谁能敌。”
A、毛 * *
B、周恩来
C、朱德
