题目

MUF0061 Economics Unit 1 - Semester 2, 2025 Herd Immunity Image Analysis and Questions (5 - 7 minutes)

单项选择题

Herd immunity occurs when

选项

A.a. you have a vaccination against herd disease

B.b. a herd of elephants is immunised against disease

C.c. a sufficient proportion of the community becomes immunised against contagious disease, so as to contain the spread of disease

D.d. you hear a story about immunity

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标准答案

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思路分析

Option d: 'you hear a story about immunity' This op......Login to view full explanation

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