卫生类A级：完形填空New York Students
The Centers for Disease Control and Prevention has confirmed 1of swine flu in eight students at a New York preparatory school， Mayor Michael Bloomberg said Sunday. The students have had only 2 symptoms and none have been hospitalized， he said. Some of the students have already recovered.
More than 100 students were absent from 3 due to flu-like symptoms last week. New York health officials tested samples for eight students Saturday and determined the students were probably 4 from. swine flu， and the CDC confirmed the5 on Sunday， Bloomberg said.
The announcement brings the 6 of confirmed swine flu cases in the United States to 20. Bloomberg and New York Health Commissioner Tom Frieden said there is no 7of a citywide outbreak of the flu， and no sign of a potential8of swine flu at other schools.
Some students at the school 9spring break1 in Mexico， Bloomberg said， but authorities have not determined 10any 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 11 on the flu to someone else， he noted.
Frieden called 12 students who are home sick to stay home for 48 hours after their symptoms subside.
If symptoms are normal for a regular kind of flu， there is 13 need to go to a hospital， said Bloomberg. If symptoms become severe， as with any 14 ， people should go to the hospital， he said.
St. Francis， which has 2，700 students， announced it will remain closed for two days. 15 whether the students illnesses have been minor because theyre young and healthy or because it is a minor strain of the virus， Frieden responded， "We dont know. "
练习：
1. A cases
B bases
C doses
D noses
2. A common
B physical
C mild
D wild
3. A work
B home
C school
D hospital
4. A escaping
B surviving
C dying
D suffering
5. A treatment
B diagnosis
C doubt
D choice
6. A point
B number
C spread
D value
7. A chance
B need
C hope
D sign