A：声源处
B：传播过程中
C：人耳处
D：声源和人耳处
若一元二次方程x2+2x+m=0有实数根，则m的取值范围是（ ）.
Hearing the good news that he had been admitted into his dream university after so many years of hard work, his parents couldn't help b____ into tears.
