huge amounts of和large amounts of分别是形容可数还是不可数

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• huge amounts of和large amounts of分别是形容可数还是不可数
• huge amounts of和large amounts of分别是形容可数还是不可数
• 提问几道GRE数学题!都是绿皮上的,本人数学不大好,P275.39In how many of the integers between 1 and 100 does the digit 5 occur exactly once?答案是18,题目啥意思,如何做?P231.2A train travels 60 miles per hour for 3 hours and then 45 miles per hour for 2 hours.What is the train's average speed in miles per hour during the 5-hour period?P246.17A teacher has a total of at least 110 students enrolled in her classes.If the teachers has an average of exactly 27 students enrolled per class,what
• .____by his expression,he must have got "A" in the exam.A) Judging B) Judged C) Having been judged D)to be judge