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Questions 7 to 10 are based on the following passage. At the end of the passage，you will be given 20 seconds to answer the questions.
Now, listen to the passage.
7. After going over some basic about hearing, the teacher will lead the students to_____.
A. put the theory learned into practice
B. finish and check their homework
C. solve some academic problems
D. cure people who are experiencing hearing loss
8. All the following can damage hearing EXCEPT______.
A. excessive noise
B. too much moderate noise for a long time
C. intense noise for even a short time
D. moderate noise for a short time
9. Generally，it isn't harmful to our ears，when sounds are up to_____.
A. 140 decibels
B. 100 decibels
C. 80 decibels
D. 60 decibels
10. Once you are up to around 140 decibels' you will_____.
A. suffer from hearing loss
B. feel pain in your ears
C. feel normal
D. faint
