阅读理解。 Studying for an exam while listening to music is not smart, because background music can injure your ability to perform memory tasks, new research has found. Study participants were asked to recall a list of eight consonants (辅音字母) in the order they were presented. They did this while in five different sound environments: quiet surroundings; music they liked music they disliked; changing state; and steady state. The participants recall ability was poorest when listening to music, regardless of whether they liked or disliked it, and in changing-state conditions. The most accurate recall occurred when participants performed the task in steady-state environments, according to the study published online in the journal Applied Cognitive Psychology. The poorer performance of the music and changing-state sounds are due to the audible (听得 见的) change within those environments. This hurts the ability to recall the order of items, via retelling, within the presented list, explained lead researcher Nick Perham, a lecturer in the School of Psychology at the University of Wales Institute in Cardiff, in a news release from the journal's publisher. 'Mental arithmetic (算术) also requires the ability to memorize order information in the short-term via retelling, and may be similarly affected by their performance in the presence of changing-state, background environments,' he added. 1 When performing a challenging mental task, you'd better do it ______. A. in the music you like B. in the music you dislike C. in changing state D. in steady state 2. The reason why the participants performed poorly while listening to music is that ______. A. the music was too loud B. they got lost in the music C. the changeable sound disturb the input of the information D. they couldn't focus their attention 3. Which of the following is in steady state? A. 12345. B. 33333. C. abcde. D. a1b2c. 4. We can learn from the text that ______. A. When doing our homework, we'd better play sweet songs B. Music may affect our performance of memorizing C. Mental arithmetic means retelling the order of information D. Reading in the noisy street can strengthen our ability of concentrating