朱砂的成人每次用量应是（）
A.1～5g
B.0.1～0.5g
C.0.003～0.01g
D.5～10g
E.15～30g
参考答案：B
It's a good habit _____ breakfast every day. [ ]
A. had
B. have
C. to have
D. having
疏散照明在任何时候均应处于点亮状态。
