单项选择题 Everyone in the office knows that Melinda takesinfinitecare over her work. The underlined part means______.(2013-73)

单项选择题 He is fed up with the same olddrearyroutine, and wants to quit his job. The underlined part means______.(2013-67)

单项选择题 Our experiment was conducted under optimal condition. The underlined part means ______.(2014-80)