We welcome rain, but a（an） ________ large amount of rainfall wil

We welcome rain, but a（an） ________ large amount of rainfall will cause floods.
A、extensively
B、extremely
C、specially
D、constantly
【正确答案】：B
【题目解析】：extremely 极端地; 极其。句意：我们欢迎下雨，但过多的降雨会引起洪水。