The little child ______ go out alone at night，so he ______ walk in the dark that night.[ ]

A. daren't；didn't dare to

B. doesn't dare；dare not to

C. isn't dare to；dared not to

D. doesn't dare to；dare not to

铜鼻子压接管外侧应采用绝缘材料保护，正极用（），负极用蓝色，保护地用黄色。

A.红色

B.蓝色

C.黄色

D.绿色