单选题I am so tired today.

问题补充：

单选题Iamsotiredtoday.Iswam_____theriverinthemorningandIwalked____theforestintheafternoon.A.through, throughB.across, acrossC.across, throughD.through, across

答案：

C解析across 与through的区别在于，前者表示从物体表面穿过，而through表示的是从物体的内部穿过，或某个空间穿过，根据本题的要求，选C