家蚕发育过程要经过卵→幼虫→蛹→成虫四个时期,这样的发育过程称为变态发育。( )
错
题目分析:这个发育过程称为完全变态发育。变态发育包括完全变态发育和不完全变态发育。
Jenny was very sad over the loss of the photos she had shot at Canada, ____ this was a memory she
especially treasured.
A.as
B.if
C.when
D.where
确诊溃疡活动性出血的最可靠方法是()
A.询问病史
B.胃液分析
C.X线钡餐检查
D.大便潜血检查
E.早期胃镜检查