【拓展】a pile of / piles of意为"大量，许多"。如：

I've got piles / a pile of things to do today.

pile on意为"剧增，猛增（尤指体重）"。如：

The weight just piled on when I was abroad.

【考例1】Laura was away in Paris for over a week. When she got home, there was a pile of mail waiting for her. (辽宁2013单项填空)

【考例2】Still others lay the blame on the Americans, complaining that pounds have piled on thanks to eating too much American-style fast food. (湖北2013 阅读理解C篇)

5. consume

【点拨】consume是动词，意为：①消耗，耗费（燃料，能量，时间等）；②吃，喝，饮；③使充满（强烈的感情）（常用结构为consume sb. with sth.）。如：

Our high living standards cause our present population to consume 25 percent of the world's oil.

The boy consumes vast quantities of chips with every meal.

Shawn was consumed with guilt.

【拓展】consumer n.意为"消费者，顾客，用户"。consumer products意为"消费品"。如：

It will offer a wider choice of goods for the consumer.

The choice of consumer products available in local shops is small.

consumption n.意为：①消耗，消耗量；②消费。如：