D．Possible to understand.

　　解析：选C　词义猜测题。根据第二段可知，每年浪费的食物的重量超过了860万头地球上最大的动物--蓝鲸的重量，也超过了230万架世界上现有的最大的飞机--空中客车A380的重量。这也好比在世界拥有超过13亿人的人口最多的国家--中国，人均向垃圾桶里倾倒一吨的食物。由此可推知这种现象使人难以理解。unfathomable意为"难以理解的；深不可测的"。

　　2．It can be learned that the food the rich waste can support ________.

　　A．half the people in Europe

　　B．most people of America

　　C．most people of Asia

　　D．most people of Africa

　　解析：选D　细节理解题。根据第四段倒数第二句"Basically, the wasted food of the rich could feed much of the African continent."可推知，富有的国家浪费的食物可以养活非洲大陆大部分地区的人。

　　3．The author gave his personal tip based on the fact that ________.

　　A．he was once very poor

　　B．he was once a farmer

　　C．he once worked in a restaurant

　　D．the price of food is very high

　　解析：选C　细节理解题。根据最后一段第二句"I used to be a waiter years ago and will never forget the amounts of food I saw left on the table after the bill was paid."可知，作者的建议是根据他曾是一个餐馆服务员的工作经历而给出的。

　　4．What is the purpose of this article?

　　A．To show the author's opinion of food.

　　B．To let us live more wisely and not waste food.

　　C．To show the amount of wasted food a year.

　　D．To ask the richest countries to help African people.

解析：选B　写作意图题。根据第一段倒数第二句"And it turns out we're all to blame for this shaming fact: 30% of all food produced in the world each year is wasted or lost."和最后一段最后两句"There's no reason to waste ... and shop just a bit more wisely."可推知