What physical feature had the greatest effect on China's contact with other countries? O Vast, flat deserts made northward travel easier. O Extensive highlands made westward travel difficult. O River systems nelped travel between north and south. O High, dangerous mountains blocked southward travel.

What was one important characteristic of the russian military during world war i? a. it had more advanced military technology than its western european allies. b. it was an all-volunteer military that enjoyed high morale throughout the war. c. it defended russian territory but refused to attack german positions d. it was unable to provide its forces with adequate weapons and supplies.