下列关于测验质量标准的表述,正确的是
A.难度达到0.75以上的项目才能保留
B.区分度低于0.4以上的项目应该删除
C.信度一般情况小于1
D.效度必须达到0.6以上
正确答案是C
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Suburbia (郊区) As the cities became more crowded and as the means of transportation improved, middle-class residents (居民)of the city began to move out. In the suburbs they could find ____41___ (safe), more attracti