The discovery __3__(make) by a team __4__(consist) of scientists from the Massachusetts Institute of Technology (MIT) and high school students __5__ were seeking a natural water filter—one that would help communities in developing countries that do not have __6__(accessible) to modern water filter systems.

　　The __7__(research), led by Professor Rohit Karnik, decided to turn to trees for help because they could allow liquid to flow through, while blocking out air bubbles.

　　They began by cutting 1.5­inch­wide sections of tree bark from the branches of a white pine tree. The people related then tested the wood's filtering ability by pouring water containing red dye particles of different sizes through. __8__ their amazement, they found that it was effective in trapping all the particles. __9__(encourage), the team conducted __10__ experiment, this time with water that contained bacteria. Sure enough, the sapwood held back 99% of the bacteria, allowing only 1% to flow through.

　　1．______　2.______　3.______　4.______　5.______

　　6．______　7.______　8.______　9.______　10.______

　　语篇解读：树木对于我们的日常生活非常重要。它们不仅给我们提供食物、木材，最重要的是它们还给我们提供生存必需的氧气。但树木对于我们的生活还有一个非常重要的作用，即它们可以阻止有害细菌进入我们的水源。

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