D

    Electronic devices are changing the way people listen to music. But studies show the devices may be causing hearing loss in many people. Some experts say people may be playing them too loud and for too long.

    The American Speech-Language-Hearing Association did a study. It involved three hundred high school students and one thousand adults.

    Forty percent of students and adults said they set the sound levels, or volume, at high on their iPods. But students were two times more likely to play the music at a very loud volume. More than half of the students said they would probably not limit their listening time. And about a third said they were not likely to reduce the volume.

    Hearing experts say part of the problem is the listening equipment people are using. They say large earphones that cover the whole ear are probably safer than the smaller earbuds that come with most music players. Earbuds are thought to be less effective than earphones in blocking out foreign noises.

   Hearing loss may not be apparent for years. But once it happens, it is permanent. About thirty million Americans have some hearing loss. One third of them lost their hearing as a result of loud noises.

   The American Speech-Language-Hearing Association is working with manufacturers(生产商) and government officials on setting rules for use of portable music devices. The group says the best way to protect your hearing is to reduce the volume, limit listening time and using earphones that block out foreign noises.

67. According to the study, more than half the students ________.

A.keep listening to music for a long time

B.would reduce the volume of music

C.would stop listening to music

D.would reduce the time on listening to music

68. Which is NOT true according to the fourth paragraph?

A.The listening equipment used by people need to be improved.

B.Earbuds can’t block out foreign noises completely.

C.Most music players are equipped with earbuds.

D.Listening to music with large earphones on is less effective.

69. We can conclude from the text that ________.

A.only when rules for use of portable music device are worked out, can hearing loss disappear

B.manufacturers are the main cause that lead to hearing loss

C.it was not listening equipment but listeners themselves that mainly result in hearing loss

D.using large earphones is the best way to protect your hearing

70. The underlined word “apparent” means _________.

A.anxious                B.obvious                    C.serious             D. conscious