13: According to Maslow''s need theory,（ ）.
A: lower needs and higher needs should be satisfied after an individual travels
B: higher level needs take more efforts to fulfill
C: an individual is motivated to travel after he has lower and higher needs
D: lower needs should be satisfied before higher level needs are demanded attention
(责任编辑：admin)要这答案加QQ：800020900 或加微信：vq800020900 获取
