Choose A, B, C or D as the best answer.30. The author’s main argument is that __________.单项选择题
A
a. It is not just about whether we employ clean energy, but what technologies, where and how.
B
b. solar and wind power are the most acceptable forms of renewable energy.
C
c. there needs to be more research before we invest more in renewable energy forms.
D
d. there is no such thing as an environmentally ‘clean’ energy source.
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