今天备考资料是一篇关于可替代燃料A-21的文本下载，还整理了相关词汇，供同学们整理和复习。这些托福听力下载文本资料，可以帮助同学们积累有用的备考资料，用于日常的练习，对大家顺利应对考试有着非常重要的意义和价值，希望大家能够认真学习。
1. alternative: adj. 选择性的，二中择一的
2. pass on: 传递
3. naphtha: n. [C]石脑油
4. promising: adj. 有希望的, 有前途的
5. combustion: n. [C]燃烧
7. claim: n. [C]声称，主张
8. fear: v. 害怕，担心
9. antifreeze: n. [C]防冻剂
10. Reno: 里诺(美国有名的“离婚城市”, 在内华达州西部, 凡欲离婚者, 只须在该市住满三个月, 即可离婚)
11. Nevada: 内华达州
Since we've been discussing alternative fuels lately, I wanted to pass on to you some information I read about a new fuel that's been in the news a lot lately. It's called A-21. It's composed of water and a chemical known as naphtha. It seems to be a very promising fuel because it's much cleaner than the gasoline that we use today. That's not to say that it doesn't pollute, but it is cleaner. A-21 isn't like some other alternative fuels that require completely new types of engines. A-21 still works in regular, everyday combustion engines—like the ones in cars—with only minor mechanical modifications. So changing over wouldn't be a big deal. You may doubt some of these claims as many researchers have. Some people feared that because it contains about 45 percent water it would freeze in the winter. But a small amount of antifreeze was added to it, and that seems to have solved the problem. A-21 has recently undergone street tests in buses in Reno, Nevada. So far it seems to work just fine. This is a good thing, especially in Nevada, because the state government there has passed a law requiring that a large percentage of vehicles in Nevada run on alternative fuels. A-21 should help.
以上是小编为大家带来的老托福听力下载部分文本资料原文呈现，可以扫描获取完整资料。