It is virtually impossible to () the number of people in the world who have acquired an adequate working knowledge of English in addition to their own languages.

A. appraise

B. evaluate

C. assess

D. estimate

俗指毛知母根茎顶端残留的浅黄色的叶痕及茎痕的术语是（）

A.金钱环

B.金钱眼

C.金井玉栏

D.金包头

E.金线吊葫芦