单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
What is the second part of the solar water heater used for

A．Heating the water.
B．Letting the water flow out.
C．Letting water flow into the system.
D．Holding water for the system.

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单项选择题

单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. What is the second part of the solar water heater used for 您的浏览器不支持 audio 元素。