单选题
Which of the following is NOT mentioned as one reason why energy problems cannot be easily solved ?
A、
(A) There's a deep-rooted suspicion towards alternative energy among the public.
B、
(B) Huge investments of various resources are required to achieve energy independence.
C、
(C) Some oil producing countries are not politically stable.
D、
(D) A large number of oil producing countries do not regard US as their friend.
【正确答案】
A
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