华支睾吸虫的感染阶段是()
A.囊蚴
B.毛蚴
C.虫卵
D.成虫
E.尾蚴
参考答案:A
等高线图所示的典型地貌是我国境内的
A.河流冲击扇
B.新月型沙丘
C.喀斯特峰林
D.古风蚀城堡
Tired _______ he was , he decided not to trouble her.
A.as
B.although
C.unless
D.even if