Which of the following actions is NOT part of green life?

A．Burning rubbish in the open air.

B．Planting trees in spring.

C．Walking or riding bikes to school.

D．Taking a shopping basket when going shopping.

强化的程式可分连续式和间隔式，而间隔式又可分为( )。

A．定时间式和定比率式

B．变时间式和变比率式

C．时间式和比率式

D．即时强化和延缓强化