1) Which one of the following has a negative charge? a) protons b) electrons c) neutrons 2) Which one is an insulator? a) glass b) steel c) copper 3) Which one is a conductor? a) rubber b) wood c) silver 4) Lightning is an example of a) static electricity b) current electricity c) sound energy 5) More vibrations per second produce a) noise b) high sound c) silence 6) is the a) kidneys b) pancreas c) liver 7) which artery supplies blood to the heart muscle? a) aorta b) coronary artery c) pulmonary artery

Табло

Визуален стил

Опции

Шаблон за превключване

Възстановяване на авто-записаната: ?