答案解析：

36. desperately
解析：此处需要一个副词修饰动词struggles，注意元音字母e、a的正确排列。
37. trapped
解析：此处需要过去分词表被动，注意双写p。
38. buried
解析：此处需要分词作伴随状语，bury是“埋”的意思，应该用过去分词。
39. appearance
解析：此处需要名词作in的宾语，注意双写p和字母组合ance。
40. mass
解析：此处需要单数可数名词，a mass of为短语“大块，大量”，不可错写成mess。
41. grains
解析：根据谓语are，此处需要可数名词复数形式，grains of sand表示“沙粒”。
42. stretches
解析：此处需要一个名词，连接介词in，注意用复数形式其后加es。
43. doomed
解析：此处需要形容词或分词，be doomed to do sth.为固定表达，意为“注定会……”。
44. 标准答案：It is panic that creates the condition that can result in death, for the more a person struggles, the worse matters become
听音关键：panic, creates, condition, result in death, more, struggles, worse matters
答案重构：It is panic that creates the condition resulting in death, for more struggle means worse matter
画龙点睛：这是个因果主从句，主句用强调句式，里面还含有定语从句，原因状语从句用the worse...the more的结构。有点复杂，听写时可以简化。
45. 标准答案：A man trapped in quicksand should either lie back, or not move at all, except to stretch out his arms
听音关键：trapped, lie back, not move, except to stretch, arms
画龙点睛：此简单句建议被陷入流沙的人应该如何做，句型不复杂，不建议改写。
46. 标准答案：With feet held still, and slow movements of arms, as in the backstroke in swimming men have managed to roll to safety and reach firm ground
听音关键：feet held still, slow movements of arms, backstroke in swimming, safety and reach firm ground
答案重构：Standing still, and moving arms slowly, as in the backstroke in swimming men have managed to reach safety and firm ground
画龙点睛：此句为简单句，但因为有方式状语、比较状语而显得较复杂，注意and连接的两个with短语可以改造成分词结构，as引导的比较状语可以保持不变。主句中的两个动词可以合而为一。