单选题 Questions 11 to 13 are based on the following radio program "Science around Us". You now have 15 seconds to read Questions 11 to 13.

单选题 Why does Dr. Johnson suggest building a greenhouse near a power station?

A、 It is convenient to get electricity.
B、 It helps to clean the air.
C、 The exhaust from the plant can be made use of.
D、 The wasteland around the station can be made use of.

【正确答案】 C

【答案解析】

单选题 Which of the following can be used as fertilizer?

A、 Waste fuel from the power plant.
B、 Raw materials used to produce electricity.
C、 Waste water from the power plant.
D、 Carbon dioxide produced from burning fuel.

【正确答案】 D

【答案解析】

单选题 Why does Dr. Johnson want to use a gas-burning plant?

A、 It generates more hot air.
B、 It produces more carbon dioxide.
C、 It does not dump sulfur dioxide into the air.
D、 It does not release pollutants into the air.

【正确答案】 C

【答案解析】