咽鼓管是通向咽部的通道,它的一端通向[ ]
A.外耳
B.中耳
C.内耳
D.鼻腔
答案:B
--Hello, Kate. How is your weekend at home?
--Awful! You know it is the first time I ____ alone at home, bored to death.
A.has left
B.had left
C.had been left
D.have been left
共青团诞生于()
A.1920年
B.1921年
C.1922年
D.1923年