题干
I was still sleeping when the fire ________, and then it spread quickly.
A：broke out
B：put out
C：came out
D：got out
答案(点此获取答案解析）
A
I was still sleeping when the fire ________, and then it spread quickly.
A：broke out
B：put out
C：came out
D：got out
处有极值，则函数
处的切线的斜率为 （ ）