—Dave, it’s dangerous to swim here. Look at the sign.

—Oh, I _______ it. Thank you.

A．didn't notice

B．won't notice

C．hadn't noticed

D．don't notice

用性引诱剂杀灭农业害虫是利用(    )   

A．昆虫的取食行为

B．昆虫之间的通讯

C．昆虫的学习行为

D．昆虫的迁徙行为