A. is a magnet
B. is placed in the middle ear
C. helps cure infections
D. can be removed
D
Dẫn chứng: This produces a clearer sound. 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. It will probably help no more than 20 percent of all people with hearing problems.
Đáp án đúng: D. can be removed
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