题目

It is required that food makers remove trans fats from products, since trans fats are not widely ______ as safe.        A. adopted                  B. harvested                C. recognized              D. operated 答案：C13．找出下面每组数的最大公因数，填在横线上．（1）2和82；（2）4和91；（3）18个639；（4）24和153；（5）17和251；（6）35和555．