【正确答案】 B

【答案解析】[听力原文]
Welcome, everyone. As part of your orientation today, I"ll be giving you a tour of our ice cream factory to show you the different stages of production. But first, let me explain some important principles in the manufacture of ice cream. We follow the processing guidelines of the Food Safety Administration to ensure the safety and quality of our raw ingredients and finished products. In this regard, the equipment used, including storage containers and freezers, should be adequately sterilized and sanitized. All staff members should watch for possible sources of contamination that can lead to serious problems with products and harm consumers. I"ll be giving each one of you a copy of the employee manual to look over. I think we"re ready to proceed to the factory.

[解析] 综合理解题 人物身份
本题是询问听者的身份，不要漏听与身份和职业有关的内容。讲话开头提到“As part of your orientation today, I"ll be giving you a tour of our ice cream factory...”，即作为入职教育的一部分，将会带领大家参观冰淇淋工厂，由此可知听者是新入职的员工，故正确答案是B. New employees。

【正确答案】 A

【答案解析】[解析] 细节题 方法
本题是询问工人如何保证产品的安全，注意听与题目中的核心词ensure the safety of products有关的内容。讲话中提到“...to ensure the safety and quality of finished products...the equipment used, ...should be adequately sterilized and sanitized.”，即为了保证产品的安全性和质量，对使用过的装备要进行适当的杀菌和消毒，故正确答案是A. By keeping the machines clean。

【正确答案】 C

【答案解析】[解析] 细节题 原因
本题是询问听者为什么要注意可能出现的污染，注意听与题目中的核心词watch for possible contaminations有关的内容。讲话中提到“All staff members should watch for possible sources of contamination that can...harm consumers.”，即一定要注意会对消费者造成伤害的可能的污染源头，故正确答案是C. They are a danger to consumers.。