UNIT 4

1. His employers could not complain about his work because he was ______ in the performance of his duties.

A. derelict B. penetrating C. diversified D. assiduous.

employer 雇主，老板

employee 雇员

assiduous 勤奋的

insidious 阴险的，狡诈的

derelict 遗弃物

relics 遗骨

relict 残余物

penetrate 穿透

permeate 渗透

diffuse 弥漫

diversify 使不同