问题
The greatest help the passage gives us is 查看材料
A:to introduce a food guide to the world
B:to provide us with knowledge of six food groups
C:to suggest a way of eating for a healthy life
D:to find the main cause of some serious diseases
B:to provide us with knowledge of six food groups
C:to suggest a way of eating for a healthy life
D:to find the main cause of some serious diseases
正确答案是：
