Is she _________ a skirt today?[ ]

A. put on       

B. wear        

C. putting on    

D. wearing 

Passage Three

In the author’s opinion, ______.

A．learning plays an important part in most aspects of a child’s development and change

B．there are hardly any principles of learning which are generally accepted

C．a child never learns anything unless he has some need or desire for it

D．a child should not be rewarded until he has learned a response