Now since the assessment of intelligence is a relative matter we must be sure that the scale with which we are comparing our subjects provides valid or fair comparison.

A．comparable

B．comparative

C．competitive

D．compatible

模拟保护色的形成过程的实验，其结果是（　　）

A．具有漂亮颜色的小纸片不易被发现，幸存数目多

B．具有保护色的小纸片不易被发现，幸存数目多

C．具有鲜艳颜色的小纸片不易被发现，幸存数目多

D．具有暗淡颜色的小纸片不易被发现，幸存数目多