单项选择题

A．the students
B．class preparation
C．class atmosphere
D．class interaction
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将and改成or。或在and与a之间加not。
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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