liveatadepthofmorethan3100feet为什么live后面用的是at一题语法填空原句是HisfinalchoiceIsanunusualseacreaturecalledVenus‘flowerbasket——akindofspongethatlivesadepthofmorethan3100feetandbuildsit

Question

live at a depth of more than3100 feet 为什么live后面用的是at
一题语法填空 原句是 His final choice Is an unusual sea creature called Venus‘flower basket——a kind of sponge that lives____a depth of more than 3100 feet and builds its body out of silica,the same material used to make glass.
答案说那个空是填at 可是没有解析 要快因为我急用>

Answer 1

at a depth of.可看成固定搭配
Grass and clover seed should be sown at a depth of 12 - 20 mm.
禾木科草和三叶草播种深度应为 12-20 毫米.来自辞典例句
Water was found at a depth of 30 ft.在30英尺深处找到了水.