A. Transmit sound to the inner ear.
B. Help all hearing-impaired people.
C. Produce clearer sound.
D. Change sounds into vibrations.
B
Dẫn chứng: The new device will not help all hearing-impaired people only those with a hearing loss caused by infection or some other problems in the middle ear.
Đáp án đúng: B. Help all hearing-impaired people.
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