Who most likely is the speaker talking to?

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问题 Who most likely is the speaker talking to?
  
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. AII 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.

选项 A、By keeping the machines clean
B、By maintaining specific temperatures
C、By inspecting the assembly line
D、By replacing storage containers

答案A

解析 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。
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