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【简答题】
农产品安全从广义上分为 、 、可持续 发展角度的安全 三个层次。
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反馈参考答案：
举一反三
【单选题】What does the professor mean when he says this:
A.
He does not want to waste time on something the students already know.
B.
He wants the students to feel comfortable about speaking up in class.
C.
He does not think he needs to go over the topic because it is not critical.
D.
He thinks the students have made a correct assumption about the topic.
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