天籁
参考答案：
民歌随口而唱，随口用韵，随时换韵的情况。
Jane _________ under the pressure of work and she had to stay in hospital for a month.
A．broke up
B．broke down
C．broke out
D．broke away
排出不足月的活胎儿称为（）
A．隐形流产
B．小产
C．早产
D．胎儿浸溶
E．胎儿干尸化
