题目内容：
Swine Flu in New YorkThe Centers for Disease Control and Prevention (CDC) has confirmed cases of swine (猪) __________ (51) in eight students at a New York preparatory (预科的) 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 eases in the United States to 20. Bloomberg said there is no __________ (57) of a citywide outbreak (爆发) of the flu, and no sign of a potential outbreak of swine flu at __________ (58) schools.
Some students at the school __________ (59) spring break in Mexico, Bloomberg said, but authorities have not determined __________ (60) any of the students with a confirmed case of swine flu was in Mexico. Someone who traveled to Mexico may not have had any flu symptoms but __________ (61) on the flu to someone else, he noted.
Bloomberg called on students who are home sick to __________ (62) home for 48 hours after their symptoms go away.
If symptoms are normal for a regular kind of flu, there is __________ (63) need to go to a hospital, said Bloomberg. If symptoms become severe, as __________ (64) any illness, people should go to the hospital, he said.
St. Francis, which has 2,700 students, announced it will remain closed for two days. __________(65) whether the students' illnesses have been minor because they're young and healthy or because it is a minor strain (菌株) of the virus, Bloomberg responded, "We don't know. " A．fever
B．cold
C．sickness
D．flu
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