请教2003-10-14

periodic

Cell,first identified by the early microscopists,begin to be considered ______ in the nineteeth century.

A. them as microcosm of licing organisms

B. the microcosm of living organisms

答案是B，A为何不行呢？请问regard 的用法是怎样的？

robert

A: 1. them (×) 2.as（×）

consider = regard as

periodic

thanks !!!