The Great Wall travels______ deep valleys, _____ deserts and______ mountains.
A.over; across; throughB.through; across; overC.across; over; throughD.through; across; across在线课程B
试题分析：介词辨析。Through穿过；across从表面横过；over从上方越过；句意：长城穿过深深的峡谷，横过沙漠，越过高山。故B正确。
考点：考查介词辨析
点评：具体的介词的词义Through穿过；across从表面横过；over从上方越过。也要注意介词与不同的动词的连用和搭配。