将法律规范分为义务性规范、禁止性规范、授权性规范,这是按照法律规范的()分类的。
A. 内容不同
B. 职能不同
C. 性质和调整方式不同
D. 强制性程度不同
We may infer from the leaflet that ______.
A. loud noises can make people lose their hearing
B. people in Boston don't have gardens because of the need for garages
C. pollution by cars costs $2,000 per person per year in Boston
D. many people in Boston can only afford cheaper cars