某塔类设备需安装在高基础上时，其采用的吊装方法应为( )。

A．直立单桅杆滑移法

B．斜立单桅杆偏心提吊法

C．单桅杆旋转法

D．吊推法

—Volunteering is becoming increasingly popular in China.

—Yeah, people are now ____that helping others is helping themselves.

A．held

B．known

C．ashamed

D．aware