环状软骨是呼吸道软骨中唯一完整的软骨环，对支撑呼吸道有重要作用
参考答案：对
赤道穿过的大洲中，面积最大的是[ ]
A．亚洲
B．非洲
C．大洋洲
D．南美洲
She wants to start an English club. Let's help her ________some good ideas.[ ]
A. catch up with
B. come out
C. come up
D. come up with
