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

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