听录音,补全单词。Listen and write down the missing letters to the sounds you hear.s_b_ ect
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听录音,补全单词。Listen and write down the missing letters to the sounds you hear.s_ _m
听录音,补全单词。Listen and write down the missing letters to the sounds you hear.s_ _ll
听录音,写单词。Listen and write down the words you hear._____
混合食物由胃完全排空通常需要( )
A. 1-2h
B. 2-4h
C. 4-6h
D. 6-8h
E. 8-10h