A-A+
A．There is no space to put in solar units.B．It
问题详情
A．There is no space to put in solar units.
B．It is decided by Mother Nature.
C．It is not the right time to use it.
D．It costs too much to use it.
参考答案
正确答案：D
解析：说话者提到了太阳能的优势与好处，但紧接着话锋一转，说太阳能没有广泛推广是有很多原因的，最大的原因就是钱的问题。D表达的正是此意，故为本题答案。
