13. To warm himself, the sailor sat in front of the fire rubbing one bare foot against __________
A
another
B
the other
C
other
D
either
one…the other固定搭配，一个……另一个。故选项B符合答案。
根据句意“为了让自己暖和，水手坐在火堆的前面，用一只赤脚摩擦另一只。”
对代词的辨析不准确。