The challenge facing public health officials is to (i)______an outbreak of disea

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问题 The challenge facing public health officials is to (i)______an outbreak of disease and then (ii)______that school-children are immunized.

选项

答案 B，E

解析公共健康机构的目的就是让大家不得病，所以要“阻止”或者“预测”疾病的爆发，并“确保”大家有免疫力。effect实现，anticipate预料，sustain经受／支持；allege断言，ensure确保，question审问。答案选BE。

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