题目

人类之所以能够进入电气时代，与哪一位科学家密不可分( ) A . 牛顿 B . 达尔文 C . 瓦特 D . 爱迪生 答案：DI can't read these new words, so I have to ______ in the dictionary. A．look it up B．look up it C．look them up D．look up them