Thanks ______ ______ me ______ my English. [ ]

A. with, help, for

B. for, help, for

C. with, helping, with

D. for, helping, with

“龙生龙；风生风；老鼠的儿子会打洞．”这种现象属于生物的（　　）

A．进化

B．遗传

C．变异

D．环境影响