A good knowledge of the difference between marketing and selling leads to （）

A．are forms of biological development
B．have actually developed from hunting
C．are essentially forms of taming the prey
D．have changed the ways of hunting

A．by mercilessly exploiting women workers in the clothing industry
B．because they are capable of predicting new fashions
C．by constantly changing the fashion in women’ s clothing
D．because they attach great importance to quality in women’s clothing

A．was intersted in flowers and insects in his childhood
B．lost his hearing when he was a child
C．didn’t like his brothers and sisters
D．was born to a naturalist’s family