[简答题]Without electricity,there would be no modern industry.

[填空题]The modern age is an age of electricity. People are so used to electric lights, radios, televisions, and telephones that it is hard to{{U}} (36) {{/U}}what life would be like without them. When there is a power failure, people{{U}} (37) {{/U}}about in faint candlelight, cars {{U}} (38) {{/U}} in the streets because there are no traffic lights to guide them, and food {{U}} (39) {{/U}}. in silent in refrigerators. Yet people began to understand how electricity works only a little more than two centuries ago. Nature has{{U}} (40) {{/U}}been experimenting in this field for millions of years. Scientists are discovering more and more that the living world may hold many interesting {{U}} (41) {{/U}} of electricity that could benefit {{U}} (42) {{/U}} All living{{U}} (43) {{/U}}send out tiny pulses of electricity.{{U}} (44) {{/U}} The brain, too, sends out brain waves of electricity, which can be recorded in an electric device. {{U}}(45) {{/U}}—often so small th