–How about the exhibition that day?

--It was very noisy, but that didn’t ________ me.

A．hurt

B．impress

C．change

D．bother

弹性是（）。

A．自变量X的1%的变化引起因变量Y的变化百分数

B．自变量X值的变化引起因变量Y的变化

C．因变量Y值的变化引起自变量X的变化

D．因变量Y的1%的变化引起自变量X的变化百分数