回归分析中的简单回归是指（）
A.两个变量之间的回归
B.变量之间的线性回归
C.两个变量之间的线性回归
D.变量之间的简单回归
参考答案：C
A warm thought suddenly came to me __________ I might use the pocket money to buy some flowers for my mother’s birthday.
A．if
B．when
C．that
D．which
