单项选择题

A．80
B．250
C．100
D．337
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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
单项选择题
A．United Nations Children’s FundB．The World Health OrganizationC．International Science InstituteD．International Children’s Foundation
A．United Nations Children’s Fund
B．The World Health Organization
C．International Science Institute
D．International Children’s Foundation
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