People believe that we ______a special ability to learn language and that our brain _____ itself to the language we hear.

A．are prepared for；adjusts

B．are equipped for；adapts

C．are armed by；fits

D．are equipped with；adjusts

影响感觉阈限测量的非感觉特性因素主要是（）

A.智力水平

B.性别和年龄

C.人格

D.动机和期望