下列属于塑料制品回收标志的是（ ）
A．
B．
C．
D．
答案：D
Every evening after dinner，if not ________ from work，I will spend some time walking my dog.
A．being tired
B．tiring
C．tired
D．to be tired
人类为了生存最早就有了哪些基本的卫生保健措施.
