单项选择题


A．surveys
B．observations
C．experiments
D．interviews
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单项选择题
A．noticedB．analyzedC．interpretedD．observed
A．noticed
B．analyzed
C．interpreted
D．observed
单项选择题
Studies in single-sex schools show that ______.
A．smaller class brings lower achievements of the students
B．special attention encourages the students to do better in class
C．single sex is the only factor that influences the students' behaviors
D．single sex helps the students learn more in class
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