330kV和500kV线路应沿全线架设( )，但少雷区除外。
A．双避雷线； B．单避雷线； C．避雷针； D．避雷串。
参考答案：A
①被蜜蜂蛰过的猴子，不再取食蜂蜜；②失去雏鸟的红雀，饲喂张口求食的金鱼；③母鸡孵卵；④老鼠走迷宫而取到食物．其中属于先天性行为的是（ ）
A．①④
B．②③
C．②④
D．①③
As a young man, Comrade Zhou Enlai _____ the students movements and later _____ the Communist Party of China.
A．joined; took part in
B．took part in; joined
C．joined in; took part in
D．took part in; joined in
