塑料做的饼干？这不是玩笑，而是美国一些科学家正在认真进行的实验。
他们把塑料和农场废料切碎，加水、加氧、加热，再用酵母转化成食物。
做出来的饼干目前还不能吃，但科学家说，闻起来居然不错。
他们到底是怎么做到的？一起来读读文章，一探究竟吧～
读完后别忘了完成练习，检验一下自己的语言点掌握情况。
原文音频
Plastic cookies? Yes, really!
原文阅读
1. Scientists are working to ________ plastic and farm waste ________ （把...变成...）food.
2. The cookies ________ ________（闻起来不错）, but they are not ready to eat yet.
3. Baker’s yeast _______ ________ ________ ________（起着很大的作用）in our lives.
4. Perhaps, one day, people will ________ ________ ________（能够） make milk and meat this way.
●They cut these materials into small pieces. （改为被动语态）
→These materials ______ ______ ______ small pieces.
1. 科学家现在还在测试它们。
Scientists ________ ________ ________ them.
2. 他们甚至可以在沙漠、寒冷的地方或者其他行星上制作事物。They could even ________ food in ________, cold places or on other ________.
阅读短文，在空白处填入一个适当的词或填入括号中所给单词的正确形式。
If a cookie 1. ______ (have) plastic in it, would you eat it? In the US, some scientists are working to make this possible. They use plastic and farm waste 2. ______ (make) the cookies. The materials are first cut into small pieces. Water and oxygen 3. ______ (add) after that. Then the mixture is heated, and yeast 4. ______ (use) to turn it into food. The cookies are not ready to eat yet - the scientists 5. ______ (test) them now. But they say the cookies smell 6. ______ (good). Why make cookies this way?
The idea is to turn waste into food, and this method may help provide more food 7. ______ the future. Perhaps one day, people will be able to make milk and meat this way. Better still, they could use this method to make food in deserts, cold places 8. ______ even on other planets.
一、1. turn...into... 2. smell good 3. plays a big role 4. be able to
二、are cut into
三、1. are still testing 2. make, deserts, planets
四、1. has 2. to make 3. are added 4. is used 5. are testing 6. good 7. in 8. or
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