单项选择题
According to the passage, which of the following is a necessity（）
A．Shortened opera performances. B．Quickened paces of movies. C．Speeded-up work efficiency. D．Working on holidays.
单项选择题 30（）
单项选择题 It is implied in the passage that（）
单项选择题 It can be inferred from the passage that in the past （）
