2012年伦敦奥运会于当地时间7月27日20时12分开幕,此时北京时间为7月28日4时12分.产生上述时间差异的原因是( )
A:地球的自转运动
B:地球的公转运动
C:两地海陆位置不同
D:两地纬度位置不同
The hospital has a new system to help ____(提供)the best service for the patients.
—Are you going to have a part time job during the summer vacation?
—Yes. I think I shouldn't always my parents since I've grown up.