In order to put an end to poverty, the World Bank has switched its ______to providing technical assistance and long-term loans to developing countries.

A．concern

B．process

C．struggle

D．focus

在寒冷天气下，航后放水时应注意什么？

A、只需按正常程序放水

B、先按正常程序放水，再按程序把管路中的水吹除干净；

C、先放水，再吹除管路2分钟