单项选择题

A．United Nations Children’s Fund
B．The World Health Organization
C．International Science Institute
D．International Children’s Foundation
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单项选择题
A．80B．250C．100D．337
A．80
B．250
C．100
D．337
单项选择题
A．the studentsB．class preparationC．class atmosphereD．class interaction
A．the students
B．class preparation
C．class atmosphere
D．class interaction
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