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Trắc nghiệm: (A) What we know about certain diseases (B) are still not sufficient to prevent them (C) from spreading easily (D) among the population,(A) What we know about certain diseases (B) are still not sufficient to prevent them (C) from spreading easily (D) among the population.

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(A) What we know about certain diseases (B) are still not sufficient to prevent them (C) from spreading easily (D) among the population, (A) What we know about certain diseases (B) are still not sufficient to prevent them (C) from spreading easily (D) among the population.

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