The medical team left the village with great satisfaction, ____ a lot of local villagers.

A．treating

B．having treated

C．to treat

D．treated

通常所说的“白色污染”是指()。

A．工厂排出的烟尘

B．石灰窑产生的粉尘

C．可卡因、海洛因等毒品

D．聚乙烯等塑料垃圾