Lesson Eighteen
听力部分

Dictation: Please prepare your paper and pen.

___________ is always a _____________ for every _____. The ______________ of ____ contamination and ______________of food-borne _______ underscore the ____ for _________ in ______________ of ____. Most ______, ______ and _________________ can be _________by ______ foods to the __________________, then holding them ___________________, or _____, long enough to ____ the toxins. Any ____ of ______-______, _______ or _____---________________ that ____ food-borne ______.