—Because I met my primary school classmate ________________ on the street.
A:by accident
B:by mistake
C:in danger
(2012•锦州)目前,我国的铁路干线已与中亚铁路接轨,向西可达荷兰鹿特丹港,被世人称为“第二亚欧大陆桥”我国境内的这条干线是( )