对支撑呼吸道保持其通畅特别重要，如被损伤，常造成喉狭窄的是（）。
A.甲状软骨
B.环状软骨
C.会厌软骨
D.杓状软骨
E.以上均是
参考答案：B
My parents expected too much of me. When they heard that I had failed in the college entrance
examination, they almost _____. [ ]
A. broke up
B. broke off
C. broke out
D. broke down
复合国
