1. (Cameras) of one type or( another) have been( using) for more than( a) hundred years. A B C D
2. Electricity is the phenomenon(associated) with positively and negatively( particles) A B (charged) of matter at rest and in motion, either( individually) or in great numbers. C D
Electricity is the phenomenon (associated) with positively and negatively( particles A B charged) of matter( at rest) and in motion, either( individually )or in great numbers.