This memorial was built ______ those heroes who laid down their lives for the liberation of

the black.

A．in memory of

B．in the honor of

C．in favor of

D．in search of

在拆除吊线时，与由电力、电灯线路在吊线上面穿越时要（）拉住，在吊线钢线下面时，要采取（）措施。