In recent years, there has been a marked increase in the number of technical terms in the terminology of ______.

A．the teacher should guide all discussions by revealing her own attitude
B．children’s attitudes often come from those of other children
C．in some aspects of social studies a greater variety of methods can be used in the upper grades than in the lower grades
D．schools should offer the student opportunities for travel so that he can come into contact with people he would not otherwise meet

A．attitudes can be based on the learning of falsehoods
B．attitudes cannot easily be changed by rewards and lectures
C．worthwhile attitudes may be developed in practically every subject area
D．the attitudes of elementary school-aged children are influenced primarily by the way they are treated as infants