NLN Updated NEX Exam Questions and Answers by kayson

Persistent describes something that continues over time without stopping. Option B is the best synonym. NEX often tests duration-related vocabulary.

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The passage explains that vaccines stimulate the immune system so it can recognize pathogens and respond more quickly in the future. This means vaccines act as a training mechanism for the immune system. Option C correctly reflects this explanation. Option A is incorrect because vaccines do not eliminate all bacteria permanently. Option B is the opposite of what the passage states, as vaccines strengthen immune response. Option D is incorrect because vaccines are preventive, not treatments administered after symptoms appear. NEX reading comprehension questions often test understanding of scientific processes explained in simple language, and correct answers usually restate information using different wording rather than introducing new ideas.

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“Reluctant” describes someone who is unwilling or hesitant to act. Option C best matches this meaning. The other options suggest eagerness or readiness, which are opposites. Context clues on the NEX often rely on emotional tone.

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A precaution is an action taken to prevent harm or reduce risk. Option C best matches this meaning. NEX questions frequently use safety-related vocabulary.

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