不好意思啊现在才回复! 比如这道题 A glass was filled with10 ounces of water, and 0.01 ounce of the water evaporated each day during a 20-day period. What percent of the original amount of water evaporated during this period? (A) 0.002% (B) 0.02% (C) 0.2% (D) 2% (E) 20% 这意味着玻璃杯的容量就是10盎司吗? 这个词组对这道题倒是没什么作用,可是怕考试遇到了它发挥作用的^_^