【正确答案】 A

【答案解析】[解析] 画线词summit为名词，意为“山顶”。A项top of the mountain意为“山顶”，例：He descended from the top of the mountain.他从山顶走下来。B项bottom of the mountain意为“山脚”，例：The village is at the bottom of the mountain.村庄坐落在山脚下。C项starting point意为“起点”，例：The article served as a useful starting point for our discussion.这篇文章成了我们展开讨论的好起点。D项site意为“地点”，例：The site is off-limits to the general public.这个场所不对公众开放。故选A。