A、By foreigners. B、By the deaf or hearing-impaired. C、By blind people D、By ordinary people. B

It may be Surprising to learn that there are many deaf people who can sing. They do not sing with their voices; they sing with their hands. Using hand and finger motions to signal words is called signing. Sign language is used by people who have severe hearing problems or deaf. When they use sign language to "sing", their hands "dance". it is a beautiful sight.
    Many deaf people in the United States use American Sign Language. In ASL some signs express a specific word, while other words and names are spelled out with finger movements that represent letters. There are also special signs for special words such as love and family. Signs can also represent feelings. Just as you can change your voice to illustrate emotions, you can also change your hand movements to show different feelings.