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 articles.

　　__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.______

　　文章大意：树木作用巨大。最新研究表明，它们能去除水中的细菌。

　　1．命题立意：考查同位语从句。

　　答案：that　此处是同位语从句，又因为从句中不缺少成分，故选用从属连词that。

　　2．命题立意：考查形容词和副词的转换。

　　答案：importantly　此处most importantly是在修饰谓语动词provide，故用副词。句意为“他们为我们提供了食物和木头，更重要的是提供了氧气”。

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