答案解析：

Section C Compound Dictation
36. 答案：ranging
解析：此处需要分词作定语，range from...to在此处表示“包括……和……”。
37. 答案：principal
解析：此处需要形容词作定语，注意与音近词principle区分开。
38. 答案：enrolled
解析：此处的谓语动词要用过去式，表示“入学，参加，成为成员”，注意en和词尾-ed。
39. 答案：paid
解析：此处的谓语动词仍要用过去式，短语pay off在此处表示“成功，有回报”。
40. 答案：resolve
解析：根据空格前面的to可知此处需要动词原形。
41. 答案：channel
解析：此词注意双写n。
42. 答案：participating
解析：此处需要分词作定语，participate in表示“参与”。
43. 答案：offered
解析：根据are和by可知此处需要过去分词表示被动。不要误听成afford和effort。
44. 标准答案：But it shows that scientists can benefit from acquiring new skills at any stage of their career
听音关键：scientists, benefit from, new skills, career
答案重构：But it shows that it will do scientists good if they get new skills in their career
画龙点睛：宾语从句的主谓结构很重要，可以先记录下来，然后补充主句。
45. 标准答案：Classes are kept relatively small, usually about 20 people, providing students with the opportunity to get hands-on experience
听音关键：Classes, small, 20, opportunity, hands-on experience
答案重构：Classes are usually small with about 20 people, giving students the opportunity to get hands-on experience
画龙点睛：插入语可以用短语代替，动词可以简化。
46. 标准答案：If you wanted to do your own experiments at two in the morning there was no problem finding people happy to help you and machines ready to use
听音关键：experiments, two in the morning, no problem finding people, machines
答案重构：If you wanted to do your own experiments at 2:00 a.m., you'll easily find people happy to help you and machines for you to use
画龙点睛：抓住主从复合句中的主谓宾结构，记住逻辑关系，即使句子再长也不难写对。