单项选择题
Passage Two Questions 30 to 32 are based on the passage you have just heard.
A．Count on each other for help. B．Give each other a cold shoulder. C．Keep a friendly distance. D．Build a fence between them.
A．Its power bill reaches ￡ 9 million a year. B．It sells thousands of light bulbs a day. C．It supplies power to a nearby town. D．It generates 70 % of the electricity it uses.
A．They scare whales to death. B．They produce too much noise. C．They discharge toxic emissions. D．They endanger lots of water life.