Q21. What is the main purpose of this passage?English — Comprehensions — Question 21 of 660A. To describe common diseases caused by immune system problemsB. To explain how the human immune system works to protect the bodyC. To compare human immunity with that of other animalsD. To persuade readers to get vaccinatedPractice more English MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →