Answer of Section 2, Question 5
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) | Blank (ii) | Blank (iii) |
|---|---|---|
| (A) elaborate | (D) inducement to | (G) expense |
| (B) commonplace | (E) danger in | (H) complexity |
| (C) attractive | (F) obstacle to | (I) safety |
官方解說：
The first sentence lists a number of facts about photovoltaic cells that would provide reason to adopt them (they are safe, long lasting, etc.). The best answer choice for Blank (i) is therefore "attractive," especially because there is no reason to think that photovoltaic cells are either "elaborate" (they have no moving parts) or "commonplace." The third sentence begins with "However," indicating that there is some aspect of photovoltaic cells that is less favorable to their adoption. Since the last part of that sentence after the colon, is about the relatively high cost of energy generated by the cells, it seems clear that "expense" is the best fit for Blank (iii). We can therefore see that the best answer choice for B1ank (ii) must be "obstacle to."
Thus the correct answer is attractive, obstacle to, and expense.
難易度：1