Many people have come to realize that they should go on ___balanced diet and make___room in their day for exercise.

a. a;/  B. the; a  C. the; the  D. /; a

（2011?綦江县）下列调査中，适合采用全面调査（普査）方式的是（　　）

A．对綦江河水质情况的调査

B．对端午节期间市场上粽子质量情况的调査

C．对某班50名同学体重情况的调査

D．对某类烟花爆竹燃放安全情况的调査