gwd30-2还是不明白为什么B

2. GWD30-Q2:

Caribou are wary animals with excellent hearing, so stalking them over the treeless landscape, getting close enough to kill it with nothing but a handheld lance, as Dorset people did, required exceptional hunting skill.

1. so stalking them over the treeless landscape, getting close enough to kill it
2. so to stalk them over the treeless landscape and get close enough to kill one
3. so in order to stalk them over the treeless landscape and get close enough to kill one
4. and so in order to stalk it over the treeless landscape, getting close enough to kill it
5. and so stalking them over the treeless landscape and getting close enough in order to kill it（B）

这里的one是什么用法，我选了时候主要再a,b之间犹豫，哪位大哥帮帮忙亚。。

这里的so是不是所以的意思，如果是不定式那这句话 to stalk them over the treeless landscape and get close enough to kill one是否改为 to stalk them over the treeless landscape and  TO  get close enough to kill one比较好呢，请大侠解释，还有这个one，什么时候该用？

同意对soyl1004对so的看法，很有启发。但我不太清楚to stalk...and TO get close是否会有歧异。我推测可能和So...as的结构有关。(So to stalk and to get....as Dorset people did可能破坏了so as的结构)

回应关于one vs. it的选择: 指代的选择影响甚大，关键是了解句意，Caribou是北美驯鹿：用it变成消灭物种；若用one，重心在于强调数量。由未画线部分推论( required exceptional hunting skill)，句意应该是强调数量。故选one.

個人淺見分享...

SO應該是所以吧?

就是因為這種鹿有絕佳的聽力，所以需要特別的技巧去接近獵捕他們...

中間as Dorest people did我當插入句補充呢...