单位测验一般认为信度系数不能低于（）。
A.0.6
B.0.7
C.0.8
D.0.9
参考答案：A
同学们排队做操，排成了一个方形队伍，从前、后、左、右数小明是第5个。一共有多少人做操？
Some people believe that" King John" was written by Shakespeare, but some people think it might be written by an ______ author.
A. delivered B. anonymous C. antique D. ambiguous
