The Great Wall travels deep valleys deserts and mountains.A. over; across; throughB. thr

问题补充：

The Great Wall travels deep valleys, deserts and mountains.

A. over; across; through

B. through; across; over

C. across; over; through

D. through; across; across

答案：

A. over; across; through

(答案→)B. through; across; over

C. across; over; through

D. through; across; across

解析：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。