Walvin begins his research where most of us begin our relationship with the stuff: the sweet shops of childhood memory. If sugar is a guilty pleasure then it is one with which almost every one of us is drunk on a daily basis. The unstoppable march of sugar raises the question: why? After all, sugar cane(甘蔗)is difficult to grow and the processes of refinement and clarification required to produce eatable sugar are time-consuming andexpensive. Yet, as Walvin explains, sugar has one enormous temptation: it satisfies our seemingly born desire for sweet tastes, but the satisfaction that sugar provides comes at a terrible cost, both to those who produce it and those who consume it.

　　　Sugar changed world history more profoundly than any other crops. It fuelled the Atlantic slave trade and the African wars. We're familiar with the story of how millions of enslaved Africans were transported to the Caribbean, the US and Brazil, but the growing global demand for sugar also led to the migrations of other groups. The profitability of sugar production also inspired American producers to ship thousands of poor Indians from their homeland to the Caribbean, South America and Fiji as well as Japanese peasants to plantations in Hawaii. The story of sugar, then, is not just one of changing diets and expanding waistlines, but also one of mass migrations-both forced and voluntary, both familiar and unfamiliar.

　　　Sugar's story in the 20th and 21st centuries can only be told with reference to the development of American agricultural businesses and the giant food corporations, most notably the Coca-Cola Company. The modern anti-sugar movement is demanding better labelling and the reduction of sugar in foods and drinks targeted at children.

　　　The sugar industry stands today where the tobacco corporations stood in the 1960s, accused of knowingly contributing to a global health crisis and obesity. This is just the latest moral crisis faced by the food giants of the sweet stuff.

1.By mentioning migrations of different groups, the author aims to 　　　.

　A.illustrate the difficulty of sugar cane planting

　B.criticize the greed of American sugar producers

C.confirm the huge impact of sugar on human history