尊重他人隐私，需要强化的意识有[ ]
①规则意识②互利意识③责任意识④信誉意识
A．①③
B．①④
C．②③
D．③④
答案：D
They kept trying _____ they must have known it was hopeless.
A．if
B．because
C．when
D．where
旅游空间知识评析我国主要三个边境休闲旅游？
