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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 1.________ trees are vital to our life is not a secret. They provide us with food, wood and most 2.________ (important), oxygen. Now there is one more thing we can add to this list—blocking out harmful bacteria from water.

The discovery 3.________ (make) by a team consisting4.________ 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 access to modern water filter systems.

The 6.________ (research), led by Professor Rohit Karnik, decided to turn to trees for help 7.________ they could allow liquid to flow through, while blocking out air bubbles.

They began by cutting 1.5-inch-wide 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.

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Some men, either out of nervousness or ignorance, spend most of the time talking about themselves, often appearing to brag about their achievements or talk endlessly about their problems or work. Even the quietest man talks to his woman when love is new.

When women get together, they talk about feelings and relationships, their work, and their family. They enjoy talking but also want the give and take of talk, then listen. Women often call each other to chat. Conversation is an important part of most women’s lives.

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