If you don't know how to spell a new word, you'd better ______. [ ]

A．look up a dictionary

B．look up an dictionary

C．look it up in an dictionary

D．look it up in a dictionary

组织在（）时，更适合采用外部招聘。

A.时间和经费有限

B.需要开拓新业务领域

C.采取稳定的市场战略

D.面临易变的外部环境

E.面临稳定的外部环境