* * 流血由少渐多，腹痛加重，宫口逐渐开大，有组织物堵塞于宫口：
A．不完全流产B．稽留流产C．难免流产D．先兆流产E．完全流产
参考答案：C
-It’s time that I ____ on night duty. I must be off now.
-I’d rather you ____ at home on such a family reunion night. [ ]
A. am, stay
B. was, stayed
C. will be, to stay
D. be, will stay
教师可以通过哪些途径影响课堂气氛？（）
A.接受
B.反馈
C.输入
D.输出
