Directions: In this section of the test, there are ten paragraphs. Each of the paragraphs is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Spell out the missing letters of the word on your Answer Sheet.
Paragraph One
Food marketing brings together the producer and the consumer. The marketing of even a single food product can be a complicated process involving many producers and companies. These businesses include not only chicken and vegetable processors but also the companies that transport the ingredients and those who print labels and manufacture cans.
The c_____ of activities in food marketing.
【正确答案】：chain
