With an appropriate unit noun:(1)Part of the lake has been pollu

With an appropriate unit noun:
(1)Part of the lake has been polluted. You can see the water is covered with a ____ of oil.
(2)Let me give you a ____ of advice.
【正确答案】：film; piece
【题目解析】：【考点点击】本题考查单位名词。【要点透析】 film of意为“一薄层”;这里表示水面上覆盖着一层油。 advice是不可数名词,常用 piece ofpieces或 of来修饰。