单选题
The cost of living in Liberia, West Africa, has ______ in the past five years because of the internal conflicts.
【正确答案】
A
【答案解析】skyrocket是个形象词，意即“像火箭那样快速升空”。辨义；A．skyrocketed，像火箭那样快速升空，飞速上涨；B．outer-spaced飞向外层空间；C．overestimated过高估计；D．under-questioned正在进行询问或考察的。根据上下文意思，可推知A为正确答案。