【单选题】
{{B}}Directions:{{/B}}
Read the following text.Choose the best word (s) for each numbered blank and markA,B,C, orD、onAnswer Sheet I.
Plastic is the panacea of the ages. Nearly every man-made object{{U}} (1) {{/U}} {{U}} (2) {{/U}}of, or at least{{U}} (3) {{/U}}its very structure, to this wonder compounD、Rain slickers, computer terminals, automobile engine parts, coffee cups (and the sugar stirrers too), breast implants, toy soldiers--they are all made up of plastic, or one of its many{{U}} (4) {{/U}}. Since the{{U}} (5) {{/U}}of civilization, humankind has been experimenting{{U}} (6) {{/U}}a multifunctional material--one that had to be equally strong and lightweight--to carry, contain and protect valuables.{{U}} (7) {{/U}}it could carry, contain and protect humans too, evenBetter. Generations of tinkerers and scientists set off{{U}} (8) {{/U}}the challenge, striking gold some 170 years ago.By mixing natural rubber with sulphur they created the world’s most utilized material ever. In developing a{{U}} (9) {{/U}}, malleable and durable substance, the most important inventions of the industrial age were to follow shortly thereafter. The automobile and airplane industries, to{{U}} (10) {{/U}}just two, owe their very existence to plastiC、And,{{U}} (11) {{/U}}celluloid plastic strips, the LumiereBrothers would never have brought moving pictures to the big screen.
The development of plastic is a story of human{{U}} (12) {{/U}}, ingenuity and luck.{{U}} (13) {{/U}}the legend now goes, in 1839, theAmerican inventorCharles Goodyear (the famous tyre company would later use his name) was experimenting with the sulphur treatment of natural rubber when he dropped a piece of sulphur treated rubber on a stove; The heat seemed to give rubber{{U}} (14) {{/U}}properties. It was stronger, more{{U}} (15) {{/U}}to abrasion, more elastic, much less{{U}} (16) {{/U}}to temperature,{{U}} (17) {{/U}}to gases, and highly resistant to chemicals and electric{{U}} (18) {{/U}}.Eyeing this as a cheaply and easily reproduced construction material, a whirlwind of work{{U}} (19) {{/U}}and the birth of{{U}} (20) {{/U}}plastic and plastic-derivatives were born from camphor to celluloid to rayon; cellophane, polyvinyl chloride (or PVC、; styrofoam and nylon were soon to follow.
A．If
B．When
C．Unless
D．Until
网考网参考答案：A
网考网解析：[解析] 本题考查对句子逻辑关系的把握。
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