Yesterday I didn't go to _____ school because I was ill and my mother went to _____ school to ask

for a sick leave for me.    [ ]

A. / ; the

B. the; the

C. the; /

D. / ; /

针对松毛虫类有下树越冬的习性，可在秋季幼虫下树前或次春幼虫上树前，刮去树干胸高处粗皮，涂刷宽3—5厘米、厚3—5毫米的毒环，阻隔和（）幼虫。

A、捕杀

B、诱杀

C、毒杀

D、触杀