寄生虫污染食品的途径有：（）
A、原料动物带有寄生虫病
B、粪便污染
C、食品生熟不分
D、食品原料遭到寄生虫卵污染
参考答案：A, B, C, D
—Why is your professor so happy recently?
—Because the theory she insisted on correct. [ ]
A. is proved
B. proving
C. was proved
D. has proved
请分析项目中出现这些情况的可能原因(200字以内)。
