[单项选择]An epidemic of swine flu (猪流感) has recently developed in Mexico and the United States, says the CDC. Swine flu has killed many people, and the outbreak has features that suggest it could become a global pandemic (瘟疫). A pandemic is an epidemic that spreads around the whole world. Pandemics also often cause more severe disease than epidemics.
Flu is a disease caused by the influenza virus. Humans, pigs, birds and other animals all can be infected by influenza viruses. Typically, influenza viruses can infect only one species, so the influenza viruses of humans are different from those of pigs and birds. However, sometimes a virus can infect more than one species. For examples, pigs sometimes can be infected not only with pig influenza viruses, but also with human and bird influenza viruses. Then these viruses can come up to one another secretly and swap (交换) genes, creating new viruses that have a mix of genes -- from human, pig, and bird viruses. That is what has happened with this

[单项选择]An epidemic of swine flu (猪流感) has recently developed in Mexico and the United States, says the CDC. Swine flu has killed many people, and the outbreak has features that suggest it could become a global pandemic (瘟疫). A pandemic is an epidemic that spreads around the whole world. Pandemics also often cause more severe disease than epidemics.
Flu is a disease caused by the influenza virus. Humans, pigs, birds and other animals all can be infected by influenza viruses. Typically, influenza viruses can infect only one species, so the influenza viruses of humans are different from those of pigs and birds. However, sometimes a virus can infect more than one species. For examples, pigs sometimes can be infected not only with pig influenza viruses, but also with human and bird influenza viruses. Then these viruses can come up to one another secretly and swap (交换) genes, creating new viruses that have a mix of genes -- from human, pig, and bird viruses. That is what has happened with this

[单项选择]An epidemic of swine flu has recently developed in Mexico and the United States, says the CDC. Swine flu has killed many people, and the outbreak has features that suggest it could become a global pandemic. A pandemic is an epidemic that spreads around the whole world. Pandemics also often cause more severe disease than epidemics.
Which of the following statements is true about a pandemic
A. It is the same as an epidemic.
B. It always follows an epidemic.
C. It is widespread and serious.
D. It kills all people who are infecte

[单项选择] Slater
Swine influenza (also called swine flu, hog flu, and pig flu) refers to influenza caused by those strains of influenza virus, called swine influenza virus (SIV), that usually infect pigs. Swine influenza is common in pigs in the Midwestern United States (and occasionally in other states), Mexico, Canada, South America, Europe (including the United Kingdom, Sweden, and Italy), Kenya, Mainland China, Taiwan, Japan and other parts of eastern Asi

• a.
  Mike Smith
  Transmission of swine influenza virus from pigs to humans is not common and properly cooked pork poses no risk of infection. When transmission results in influenza in a human, it is called zoonotic swine flu. People who work with pigs, especially people with intense exposures, are at risk of catching swine flu. Rarely, these strains of swine flu can pass from human to human. In humans, the symptoms of swine flu are similar to those of influenza and of influenza-like illness in general, nam
  

[单项选择]　8 New York Students Have Swine Flu 　　The Centers for Disease Control and Prevention has confirmed 51 of swine flu in eight students at a New York preparatory school, Mayor Michael Bloomberg said Sunday. The students have had only 52 symptoms and none have been hospitalized, he said. Some of the students have already recovered. 　　More than 100 students were absent from 53 due to flu-like symptoms last week. New York health officials tested samples for eight students Saturday and determined the students were probably 54 from swine flu, and the CDC confirmed the 55 on Sunday, Bloomberg said. 　　The announcement brings the 56 of confirmed swine flu cases in the United States to 20. Bloomberg and New York Health Commissioner Tom Frieden said there is no 57 of a citywide outbreak of the flu, and no sign of a potential 58 of swine flu at other schools. 　　Some students at the school 59 spring break1 in Mexico, Bloomberg said, but authorities have not determined 60 any of the students with
A. chance
B. need
C. hope
D. sign