世界格局多极化趋势的根源是[ ]
A．苏联解体、东欧剧变
B．世界经济格局的多极化
C．区域性经济集团的出现
D．美国经济的相对削弱
答案：B
Lydia doesn't feel like___________ abroad. Her parents are old. [ ]
A. study
B．studying
C．studied
D. to study
旧石器工业
变
变