[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. person
B. matter
C. thing
D. illness