听下面一段独白，回答以下小题。
1. How many people are damaging their hearing by listening to loud music?
2. How long should people listen to music?
3. How do loud sounds damage your hearing?
4. What’s the characteristic of the cells?
1. How many people are damaging their hearing by listening to loud music?
| A．1.1 billion | B．2 billion | C．3 billion |
| A．More than 2 hours a day |
| B．Less than one hour a day |
| C．About 3 hours a day |
| A．By listening to them unsafely. |
| B．By confusing your hearing system. |
| C．By killing off little hair cells in the inner ear. |
| A．They don’t grow back |
| B．They can grow back soon. |
| C．They can never be destroyed. |
更新时间：2020-02-13 11:43:23
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