【单选题】听力原文:The simplest way to lower your energy bills is to use less energy, and White Star Energy can help you do that. Simply call and speak to a White Star Energy expert to schedule a free home energy a...
A.
They are free of charge.
B.
They are offered once a year.
C.
They will be discontinued soon.
D.
They will become available at the end of the year.