ork C. people must rely on candlelight D. elevators and escalators do not function
28. Why does the author mention electric eels？
A. To warn the reader to stay away from them. B. To compare their voltage to that used in houses. C. To give an example of a living electrical generator. D. To describe a new source of electrical power.
29. How many volts of electricity can an electric eel emit？
A. 1,000. B. 800. C. 200. D. 120.
30. It can be inferred from the passage that the longer an eel is the . A. more beneficial it will be to science B. more powerful will be its electrical charge C. easier it will be to find D. tougher it will be to eat
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