The word "impairment" ( Line 2, Para. 1 ) probably means _______.

A．need graphic representations in order to understand higher-order language concepts
B．are good at studying English idioms but often fail to grasp higher-order language concepts
C．are not very patient with videodisc which helps them to understand the world concepts
D．tend to be deaf as well and have difficulty learning the simple concept "before and after"

A．The ape looks like human beings most.
B．People and the ape think alike.
C．People and the ape behave alike.
D．The ape is the most intellectual animal in the world.