问题补充：
So far we have done a lot to build a low-carbon economy, but it is ideal. We have to work still harder.
A. next to
B. far from
C. out of
D. due to
答案：
A. next to
(答案→)B. far from
C. out of
D. due to
解析：考查固定词组，A. next to旁边；B. far from远离；C. out of出于；D. due to由于，句子意思“到目前为止我们已经做了建设许多低碳经济，但是这离我们的理想还很远，我们不得不努力工作”
