单项选择题

A．the students
B．class preparation
C．class atmosphere
D．class interaction
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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
单项选择题
A．0.3B．0.5C．0.6D．0.8
A．0.3
B．0.5
C．0.6
D．0.8
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