part ii cloze

　　decide which of the choices given below would correctly complete the passage if inserted in the corresponding blanks. mark the correct choice for each blank.

　　television —— that most pervasive and persuasive of modern (26)____, marked by rapid change and growth —— is moving into a new era, an era of extraordinary sophistication and versatility, which (27)____ to reshape our lives and our world. it is an electronic (28)____, made possible by the (29)____of television and computer sciences. the word "television," (30)____ from its greek (tele: distant) and latin (vision: sight) roots, can (31)____ be interpreted as sight from a distance. very simply (32)____, it works in this way: through a sophisticated system of electronics, television provides the (33)____ of converting an image into electronic impulses, which can be sent through a wire or cable. these impulses, when (34)____ into a receiver (television set), can (35)____ be electronically reconstituted into that same image. television is more than just an electronics system, however. it is (36)____ of expression, as well as a (37)____ for communication, and as such becomes a powerful tool for reading other human beings. the field of television can be divided into two (38)____ determined by its means of transmission. first, there is broadcast television, which teaches the masses through broad-based airwave transmission of television (39)____. second, there is nonbroadcast television, which provides (40)____ the needs of individuals or specific interest groups through controlled transmission techniques.