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答案解析：
36. graduate
解析：此处需要修饰students的词。graduate students意为“研究生”。
37. fed
解析：空格前的were表明此处需要动词、形容词或分词，且能与up with搭配。be fed up with意为“受够了”。
38. owes
解析：此处需要动词，充当who引导的定语从句的谓语。
39. figure
解析：空格前的trying to表明此处需要填入动词。figure out意为“弄明白”。
40. track
解析：to表明此处需要动词，表目的。track作动词时，意为“追踪”。
41. credits
解析：此处需要名词，且能与earn搭配。earn credits意为“赚取信誉”。
42. popular
解析：became表明此处需要形容词。popular“流行的”。
43. professionals
解析：此处需要名词复数，与and前的students并列。professionals“专业人士”。
44. 标准答案：It now has about 3,000 users who have made transactions of more than US$875,000
听音关键：3,000 users, transactions, $875,000
答案重构：Now about 3,000 users make transactions of over US$875,000.
画龙点睛：本句的难点是数字，数字需精确。more than可以用over代替。
45. 标准答案：the amount he/she owes or is owed is shown on the homepage
听音关键：amount, owe, is shown, homepage
画龙点睛：此处不建议重构，注意he/she owes or is owed是修饰amount的定语从句。听音时需先抓住主干：the amount is shown on the homepage.
46. 标准答案：as well as the US$1,500 he owes to a friend who bought an airline ticket to India for him
听音关键：$1,500, owes, friend, airline ticket, India
答案重构：and the US$1,500 he owes to a friend for buying an airline ticket to India for him
画龙点睛：as well as 表示“除……外，也……”。
