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
8. A welcome
B outbreak
C success
D injury
9. A spent
B made
C took
D traveled
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