TASK DEFINITION: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
PROBLEM: What is a concern when using the computer?, Context: Seemingly, multitasking would cause a computer that is switching between several programs to run more slowly, in direct proportion to the number of programs it is running, but most programs spend much of their time waiting for slow input/output devices to complete their tasks. If a program is waiting for the user to click on the mouse or press a key on the keyboard, then it will not take a "time slice" until the event it is waiting for has occurred. This frees up time for other programs to execute so that many programs may be run simultaneously without unacceptable speed loss.

SOLUTION: multitasking would cause a computer that is switching between several programs to run more slowly

PROBLEM: What is reduced by playback equipment?, Context: Due to recording mastering and manufacturing limitations, both high and low frequencies were removed from the first recorded signals by various formulae. With low frequencies, the stylus must swing a long way from side to side, requiring the groove to be wide, taking up more space and limiting the playing time of the record. At high frequencies, hiss, pops, and ticks are significant. These problems can be reduced by using equalization to an agreed standard. During recording the amplitude of low frequencies is reduced, thus reducing the groove width required, and the amplitude at high frequencies is increased. The playback equipment boosts bass and cuts treble so as to restore the tonal balance in the original signal; this also reduces the high frequency noise. Thus more music will fit on the record, and noise is reduced.

SOLUTION: treble

PROBLEM: How many times did the players stage a work stoppage?, Context: The NFL Network ceased airing Arena Football League games partway through the 2012 season as a result of ongoing labor problems within the league. Briefly, the games were broadcast on a tape delay to prevent the embarrassment that would result should the players stage a work stoppage immediately prior to a scheduled broadcast. (In at least once incidence this actually happened, resulting in a non-competitive game being played with replacement players, and further such incidents were threatened.) Once the labor issues were resolved, the NFL Network resumed the practice of broadcasting a live Friday night game. NFL Network dropped the league at the end of the 2012 season.

SOLUTION:
at least once