Coronaviruses are a large family of viruses that cause disease in humans and birds.
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- According to the passage, scientists have discovered that influenza viruses ______ . A: cause ill health in wild birds B: do not always cause symptoms in birds C: are rarely present in wild birds D: change when transferred from animals to man
- l What is coronavirus? This is a very large outbreak. This is Dr. Bill Schaffner, I’m an [1] isease specialist and public health person. Coronaviruses are a whole family of viruses. For the most part, they don’t cause any real clinical illness except the [2] . But you know, from time to time, there’s a rogue coronavirus that develops. We remember SARS 2002, 2003. And then there was another, the MERS virus, the Middle East Respiratory Syndrome virus. This new virus, like those other rogue viruses, probably was first [3] to humans from animals.
- In recent years viruses have been shown to cause cancer in chickens. Viruses have also been shown to cause cancer in mice, cats, and even in some primates. Viruses might cause cancer in humans.This is a reasonable hypothesis.
- What does the professor mean where says this: A: Results are tragic when airplanes strike birds. B: Sightings of birds from aircraft are unusual. C: Airplanes do not frighten away most birds. D: There is little similarity between birds and jets.
- Why did one scientist expose birds to artificial daylight（） A: To test the relationship between daylight and a disease of the glands common to birds. B: To test the relationship between daylight and migration. C: To test the relationship between migration and temperature. D: To test the relationship between daylight and changes in the season.