3．Researchers at Baylor University were curious about whether there was a way to improve student performance .In particular，they wondered whether a technique called "targeted memory reactivation（激活，重啟）" （TMR） could be useful for studying.In TMR，certain signals reactivate memories formed during the day while a person is asleep.The researchers focused on music.
A few university students took part in the experiment.They were asked to take a class on microeconomics（微觀經(jīng)濟(jì)學(xué)），which they would be tested on the following day.During the lesson，all participants listened to three pieces of classical music.Then they spent the night in the sleep lab and while they were fast asleep，sounds were played in the background.For half of the participants，the sound was white noise，but the other half were played the three pieces they had listened to while studying.The next day they took the test and the test scores showed that the students who had been exposed to the "study music" while sleeping performed better on the test.
There were a few reasons the research group selected three classical music pieces as study music.Such music is much less distracting than music with lyrics （歌詞）.And the researchers also wanted to make sure that the music they played had obvious melodies （旋律），so that the brain could more easily form connections between the music and the study material.The three pieces they chose fit the bill perfectly.
Unfortunately，music could improve test scores the next day，but after a few months the music listeners were back to the same level as the students who slept with white noise in the background.Besides，the effect seemed to be more noticeable for female students than it was for men.Either way，listening to music at night is a study trick that could just make the difference between a passing or failing test for some people.
（1）What did the Baylor researchers try to find out？
A．The benefits of classical music.
B．Why TMR is helpful for studying.
C．Whether music can improve study.
D．Ways to ensure a good night's sleep.
（2）What did the participants do during the experiment？
A．They played different music in class.
B．They listened to study music while taking the test.
C．They put on the music of their choice while sleeping.
D．They listened to either white noise or study music at night.
（3）Why were these pieces of classical music selected as study music？
A．They are related to the study material.
B．They have distinct melodies.
C．They have memorable lyrics.
D．They are familiar to students.
（4）What can we infer from the last paragraph？
A．The effect of music wore off over time.
B．The study trick made no difference to tests.
C．White noise has the same effect as classical music.
D．Male students benefited greatly from the study trick.
