A.语音;45 B.字母;26 C.单词;50000 D.音素;45
A、http://nos.netease.com/edu-image/B5A8770A6DF4D0F1F280C94873D771AD.jpg?imageView&thumbnail=520x520&quality=100
B、http://nos.netease.com/edu-image/81B872C25336209680AE61A4433B39B7.jpg?imageView&thumbnail=520x520&quality=100
C、http://nos.netease.com/edu-image/F65DA87ECA2FFF14086D6A05E11D7931.jpg?imageView&thumbnail=520x520&quality=100
D、http://nos.netease.com/edu-image/03869A52EC3B29200EF43C7DA213340A.jpg?imageView&thumbnail=520x520&quality=100
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