In the school hall, where a meeting       , some students are busy preparing for it.

A．is held

B．has been held

C．is being held

D．is to be held

健康指导应除外()。

A．坚持母乳喂养

B．按时添加辅食

C．积极锻炼会坐

D．多晒太阳

E．按时服用预防量