According to the passage, a great variety of influenza strains can appear when_____.
举一反三
- It can be inferred from the passage that all of the following are ways of producing new strains of influenza viruses EXCEPT _____.
- As influenza is caused by a variety of species and strains of viruses, in any given year some strains can die out while others create (1), while yet another strain can cause a (2).
- According to the passage, scientists have discovered that influenza viruses_____.
- It can be inferred from the passage that all of the following are with of producing new strains of influenza viruses except ______ . A: two influenza viruses in the same animal recombining B: animal viruses recombining with human viruses C: two animal viruses recombining in one animal D: two animal viruses recombining in a human
- View the video clip and choose the best answer to each of the following questions.1. Which of the following statements is NOT TRUE according to the video? A: Human beings are the only species that can catch the flu. B: Some animals can contract certain strains of the influenza virus. C: Animals may transmit the influenza virus to humans. D: The flu can escalate from a snotty nose, needing bed rest to a global pandemic.