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【单选题】
An advantage to using solar power is that ____.
A.
you have to convert it
B.
it doesn't add gases to the air
C.
it costs around $10,000 for solar panels
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举一反三
【单选题】A reason why solar panels may NOT be a good investment is that ____.
A.
they are not efficient
B.
they produce energy
C.
companies are already making them
【单选题】At the end of the discussion, the students report back to the class about ____.
A.
their choice of an energy source to invest in
B.
how they invest their own money and energy
C.
which three energy sources they discussed