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Photovoltaic cells, which convert light directly to electricity, are safe, have no moving parts, operate at ambient temperature, and last for decades. It would therefore seem that they are one of the more (i)_____ ways to harness the Sun's energy. However, there is an obvious (ii)_____ widespread application, and that is (iii)_____: electricity generated from photovoltaic cells is getting cheaper, but it still costs more than the going rate in most places.
- Blank(i)
- elaborate
- commonplace
- attractive
- Blank(ii)
- inducement to
- danger in
- obstacle to
- Blank(iii)
- expense
- complexity
- safety
attractive , obstacle to , expense 显示答案
解析：第一句对于photovoltaic cells给出正评价，therefore之后表示结果，一空填入正面词语且符合因果逻辑，选择C，有吸引力的。However之后转折，二空需要填入比较负面的词语，而前面已经说了这种电池是safe的，因此danger肯定不会选，只有obstacle，阻碍，符合条件。第三空根据冒号之后所描述的内容，说的是这种电池比较贵，因此选择expense，花费。
翻译：可以把光转为电的光电池是很安全的，它没有移动的部分，能在常温下运运作，能持续几十年。因此是一种获取太阳能更加有 吸引力的一种方法。但是，推广起来却有着明显的阻碍：花费过高。虽然光电池产生的电越来越便宜，但是它的消耗却比绝大多数地方的现行的要高很多。
以上解析由 考满分老师提供。
