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.
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.
举一反三
- The flu is a highly (1) respiratory illness. It turns up year after year with devastating consequences, all caused by a most elusive virus. The influenza, or flu virus, is a recurring nightmare. It causes more than 36,000 deaths in the U.S each year, and was responsible for some of history’s deadliest pandemics. Like other viruses, the flu virus is a parasite. The viral agent itself called, a virion, is made of ribonucleic acid or RNA surrounded by proteins. The flu virus uses two proteins to attack its host, hemagglutinin and neuraminidase or the HA and NA proteins. The HA protein attaches a virus to a cell and lets it in. Once the virus is inside, it multiplies. Then the NA protein cuts this (2) swarm loose, sending it off to infect more cells. This triggers the immune system to bombard the swarm and to destroy infected tissue throughout the respiratory system. Unfortunately, this response can also inadvertently lead to death through organ failure or secondary infections like (3) pneumonia. The flu virus has been nearly impossible to eradicate, largely due to its uncanny ability to mutate. Since just 2004, more than 5,000 different strains of the influenza virus have been sequenced. Those that affect humans are categorized as Types A, B or C, with Type A strains being the most capable of unleashing a pandemic. Influenza A viruses mutate more rapidly, allowing them to adapt to new hosts and even cross species. Avian flu and Swine flu, for instance, are two strains of Type A viruses that through mutations, can be transmitted from birds and pigs to humans. One of the deadliest flu (4) was caused by one such virus. Between 1918 and 1919, the Spanish flu infected a third of the global population and killed up to 50 million people worldwide. Called H1N1, this particular strain of virus likely came from birds. The threat of another influenza pandemic remains. In the meantime, scientists are constantly monitoring the flu virus and developing seasonal (5) to create our best line of defense.
- Which of the following statement is true?____. A: The ability to use language separates human beings B: We can be certain that animals have a culture too C: Social scientists doubt if animals have a culture too D: Some traditional ideas about the difference between human beings and animals may be wrong
- It has been discovered that______. A: H5N1 does not transmit among human beings B: bird flu spreads only among birds C: H5N1 is a variant of flu virus D: bird flu adapts easily to other species
- Choose the best answer for each of the following questions It can be inferred from the passage that.
- Which<br/>one of the following is the reason of pandemic<br/>flu<br/>() A: virus<br/>has strong virulence <br/>(B)HA<br/>of Influenza B: virus<br/>easily produce variation, and people lack of immunity <br/>(C)<br/>NA of Influenza C: virus<br/>easily produces variation, and people lack of immunity<br/>(D)<br/>Influenza D: virus<br/>develops new subtype virus, and people lack of immunity