(单词翻译:单击)
听力文本：
Questions 3 and 4 will be based on the following news item.
问题3和问题4是关于新闻听力的。
Solar cells convert energy from the sun into electricity.
太阳能电池是将太阳能转化为电能的装置。
The researchers have replaced a toxic compound, used to make one type of solar cell,
研究人员在制作太阳能电池时用一种新的化合物替换了原来有毒的化合物，
with a chemical that is much cheaper, completely safe and works just as well.
这种化合物比之前采用的更低廉，同时它也是绝对安全的，所起的作用也是一样的。
The new compound is used to make tofu and is found in bath salts.
这种在浴盐中发现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.
它还可以从海水中提取，因此成本比目前使用的有毒的化学物质低很多。
Dr. Jon Major, who led the research at Liverpool University,
在利物浦大学发起这项研究的乔恩·梅杰博士认为，
believes that "this process could really make the difference into making it competitive with fossil fuels."
该研究可能在提高太阳能相对于化石燃料的竞争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.
要想知道实验室中的成本节省在工业规模下是否同样可行还需要做很多工作。
But the cost of solar energy has been steadily falling.
但是太阳能的制造成本一直在稳定下降。
And many involved in research in the field believe that
该领域的很多研究人员认为，
it's just a matter of time before it becomes cheaper than coal, gas and oil,
太阳能得价格迟早会比煤炭、天然气和石油低，
and one day replaces fossil fuels entirely.
然后取而代之。这只是时间问题。
Question 3.What's the advantage of the new chemical according to the news?
问题3 根据这则新闻，这种新化学物质的优点是什么？
Question 4.How many fossil fuels have been mentioned in this news?
问题4 新闻中提到了几种化石燃料？
译文属可可原创，仅供学习和交流使用，未经允许不得转载
