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聽力文本：
Questions 3 and 4 will be based on the following news item.
問題3和問題4是關于新聞聽力的。
Solar cells convert energy from the sun into electricity.
太陽能電池是將太陽能轉化為電能的裝置。
The researchers have replaced a toxic compound, used to make one type of solar cell,
研究人員在制作太陽能電池時用一種新的化合物替換了原來有毒的化合物，
with a chemical that is much cheaper, completely safe and works just as well.
這種化合物比之前采用的更低廉，同時它也是絕對安全的，所起的作用也是一樣的。
The new compound is used to make tofu and is found in bath salts.
這種在浴鹽中發現的化合物可以用于制作豆腐。
It's also found in sea water, and so costs much less than the poisonous chemical currently used.
它還可以從海水中提取，因此成本比目前使用的有毒的化學物質低很多。
Dr. Jon Major, who led the research at Liverpool University,
在利物浦大學發起這項研究的喬恩·梅杰博士認為，
believes that "this process could really make the difference into making it competitive with fossil fuels."
該研究可能在提高太陽能相對于化石燃料的競爭力方面起到很重要的作用。
More work will need to be done to see if the cost savings found in the lab can work on an industrial scale.
要想知道實驗室中的成本節省在工業規模下是否同樣可行還需要做很多工作。
But the cost of solar energy has been steadily falling.
但是太陽能的制造成本一直在穩定下降。
And many involved in research in the field believe that
該領域的很多研究人員認為，
it's just a matter of time before it becomes cheaper than coal, gas and oil,
太陽能得價格遲早會比煤炭、天然氣和石油低，
and one day replaces fossil fuels entirely.
然后取而代之。這只是時間問題。
Question 3.What's the advantage of the new chemical according to the news?
問題3 根據這則新聞，這種新化學物質的優點是什么？
Question 4.How many fossil fuels have been mentioned in this news?
問題4 新聞中提到了幾種化石燃料？
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