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题型:填空题 题类:常考题 难易度:普通

2016届内蒙古赤峰市宁城县高三下学期第三次统一模拟英语试卷

阅读下面材料,在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
The truth trees are vital to our life is not a secret.They provide us with food, wood and most (importance), oxygen. Now there is one morething we can add to this list—blocking out harmful bacteria from water.
The discovery (make) by a team consisting of scientists from the Massachusetts Institute of Technology (MIT) and high school students whowere seeking a (nature) water filter(过滤器)—one thatwould help communities in developing countries that do not have access tomodern water filter systems.
The (research), led by Professor Rohit Karnik,decided to turn to trees for help because they could allow liquid to flowthrough, while (block) outair bubbles.
They began by cutting 1.5-inch-wide sections of tree bark fromthe branches of a white pine tree. The people related then tested the wood'sfiltering ability by pouring water containing red dye particles of differentsizes through. their amazement, they found that it waseffective in trapping all the articles.
(encourage), the team conducted experiment, this time with water contained bacteria. Sure enough, the sapwoodheld back 99% of the bacteria, allowing only 1% to flow through.
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