国槐红蜘蛛以（）在枝条基部轮纹处或伤疤处过冬。
A.成虫
B.幼虫
C.若虫
D.卵
参考答案：D
I’ve been working for over twenty years and seldom so tired as now .
A．I have felt
B．I had felt
C．have I felt
D．had I felt
膳食中铁主要有哪两大类形式其吸收率有何区别饮食中有哪些因素可影响铁的吸收(需写出有利因素和不利因素两个方面)
