粉末微量升华得白色升华物,在显微镜下观察为柱形、棱形结晶的药材为 ()
A.水姪
B.全蝎
C.蜈蚣
D.土鳖虫
E.斑蝥
参考答案:E
解析:[知识点] 动物类中药——斑蝥
He spent as much time as he could ______ his spoken English. [ ]
A. improve
B. improving
C. to improve
D. improved
从半球位置来看,我国位于[ ]
A.东半球、南半球
B.东半球、北半球
C.西半球、北半球
D.西半球、南半球