—I’m sorry ,Mr.Wang. I _____ my homework at home .

—That’s OK. But don’t forget ____ it to school tomorrow.

A．forget , to take

B．left , to bring

C．forgot , to bring

D．left , to take

声束能量的丧失是由于反射和吸收等原因，称为（）。

A.吸收

B.反射

C.松弛

D.衰减

E.转换