【NPR边听边练】致力于提供新鲜有趣、饶有意味的时讯资料，致力于通过精听的方式促进听力提高，致力于不断开阔眼界和深入了解美国观点。

精听建议：
先完整地把一条新闻听一到三遍，争取掌握大意。然后，一句一句精听，力争每句话都听明白。遇到实在不懂的地方，再听写。

下面的文本材料中空缺部分里面要填的词都很简单，不过是一些值得注意的连读或者典型的美式发音哦，有些语速比较快。试试看，你能不能全部写对？

（参考文本，欢迎指出错误^^）

Take a second and imagine one of those yellow yellow smiley faces. ___1___, now imagine 50 billion smiley faces floating in a drop of water. That is what scientists are made, have made rather (更正确地), using DNA. It turns out that ___2___ our genetic code and being a basic building block of life, DNA is also great for making incredibly tiny structures. NPR's Nell Boyce reports.

For years ___3___ have been using DNA to build really simple shapes like cubes that are 1,000 times thinner than a human hair. They've done it by laboriously (费力地) designing small snippets of DNA that will ___4___ into the desired form. But a new method for building things with DNA is so much faster and easier. Even a high school student could think up a shape like a star or snowflake, and then make a DNA version within a week. Paul Rothemund came up with the idea at the California Institute of Technology in Pasadena. "Even by the time I was making smiley faces, I didn't really believe that the method worked ___5___."

来源:可可英语 http://www.kekenet.com/Article/200904/67507.shtml