绦虫头节的吸盘、吸槽及小钩等结构的主要功能是（）.
A.取食
B.附着
C.运动
D.排泄
E.防御
参考答案：B
—Today is the _____ day in my life, because I won the first prize in the competition.
—Congratulation!
A．happy
B．happiest
C．happier
D．much happier
套棚作业时，先把局部（）地方用镐头或撬棍去掉背帮物卸压。
A.煤墙
B.帮顶鼓肚
C.顶板
D.底板
