The little boy took the back way quietly and quickly to escape________.[ ]

A. to be seen  

B. being seen

C. seeing  

D. having seen

两样本均数比较的t检验，t＜t_0.05，ν，则正确结论是

A．μ₁=μ₂
B．μ₁≠μ₂
C．两样本均数相同
D．样本均数间的差异有显著意义
E．现有的样本均数差异是由于抽样原因引起的可能性很小