TOEFL Listening: TPO-TOEFL阅读TPO - 3QSZJOY34SDI030QN$

According to paragraph 2, which of the following is true about heat reservoirs with a temperature in the range of 80℃ to 180℃? A. They are under international control. B. They are more common than reservoirs that have a higher temperature. C. Few of them produce enough heat to warm large industrial spaces. D. They are used to generate electricity.