摘要：中国人发明了纸.
网址：http://m.1010jiajiao.com/timu3_id_2612890[举报]
Read and distinguish the sound of the underlined part
stockings past step top envelope
mamma long marker sir medicine
circle marsh person return egg
skirt tent dog lock market
(1)发/&/音的有：lock __________________
(2)发/+:/音的有：sir __________________
(3)发/-/音的有：step __________________
(4)发/%:/音的有：past __________________
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