The WHO（世界卫生组织）said that a billion young people are damaging their hearing with loud music. Nearly half of young people in rich countries listen to "unsafe" levels of music. The WHO said a safe time is to listen for one hour a day. The WHO said people do not talk about this problem enough. People can stop hearing loss.

Turning the sound down and listening for an hour a day can reduce hearing loss. The WHO said that, "even an hour can be too much if the sound is too loud". Loud sounds damage your hearing. They kill small hair cells in our ears, the cells help us to hear. These cells break easily. Loud noise kills them forever, they never grow back.

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1.The WHO said that a billion young people are damaging their__________with loud music.

A eyes

B hearts

C hearing

D brains

解析：选C。C 细节理解题。根据第1段第1句The WHO said that a billion young people are damaging their hearing with loud music.可知，故选C。

2.What’s the safe time to listen to music?

A 20 minutes.

B Half an hour.

C One hour.

D Two hours.

解析：选C。C 细节理解题。根据第1段第3句The WHO said a safe time is to listen for one hour a day.可知，故选C。

3.Small hair cells in our ears can help us to____________.

A see

B think

C run

D hear

解析：选D。D 综合理解题。根据第2段第4句They kill small hair cells in our ears, the cells help us to hear.可知，故选D。

4.Which is WRONG?

A People can stop hearing loss.

B Turning sound down can reduce hearing loss.

C Listening for an hour can reduce hearing loss.

D Listening for an hour is OK if the sound is too loud.

解析：选D。D 内容理解题。根据第2段第2句The WHO said that, "even an hour can be too much if the sound is too loud".可知，故选D。

5.What does the underlined word “them” refer to(指) in the last sentence?

A Ears.

B Young people.

C Hair cells.

D Loud sounds.

解析：选C。C 综合理解题。根据上文语境可知此处them指hair cells，故选C。