_____ in time for Christmas，all these gifts must be mailed immediately

A．So as to be received

B．In order to receive

C．So as to be receiving

D．In order to be received

若r=0.40，经假设检验得P<0.05（）

A.可以认为两变量存在直线关系

B.尚不能认为两变量存在直线关系

C.两变量相关关系密切

D.尚不能认为两变量存在相关关系

E.不能得出总体相关系数p≠0的结论