单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. Which of the following is the energy group NOT required to do

A．Research on alternative energy sources.
B．Study alternate-fuel transit systems.
C．Deal with energy waste.
D．Make two pieces of solar equipment.

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单项选择题

单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. Which of the following is the energy group NOT required to do 您的浏览器不支持 audio 元素。