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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