I 语言知识及应用（共两节，满分45分）
第一节 完形填空（共15小题；每小题2分，满分30分）
阅读下面短文，掌握其大意，然后从1~15各题所给的A、B、C和D项中，选出最佳选项。
The food we eat has profound effects on our health. We are what we ___1_______, as the saying goes. Although science has made enormous _____2_____ in making food more suitable to eat, it has, at the same time, made many foods _____3_____ to eat. Some research has shown that perhaps eighty percent of all human illnesses relate to ____4______ and forty percent of cancer has something to do with the diet as well, especially cancer of the colon. Different cultures are more likely to cause different illnesses because of the food that is characteristic in these cultures.
