Thetruth 61 treesarevitaltoourlifeisnotasecret.The...
问题详情:
The truth 61 trees are vital to our life is not a secret. They provide us with food, wood and most 62 (importance), oxygen. Now there is one more thing we can add to this list—blocking out harmful bacteria from water.
The discovery 63 (make) by a team consisting of scientists from the Massachusetts Institute of Technology (MIT) and high school students who were seeking a 64 (nature) water filter(过滤器)—one that would help communities in developing countries that do not have access to modern water filter systems.
The 65 (research), led by Professor Rohit Karnik, decided to turn to trees for help because they could allow liquid to flow through, while 66 (block) 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. 67 their amazement, they found that it was effective in trapping all the articles. 68 (encourage), the team conducted 69 experiment, this time with water 70 contained bacteria. Sure enough, the sapwood held back 99% of the bacteria, allowing only 1% to flow through.
【回答】
62. Importantly made ral 65. reserchers
66. blocking 68. Encouraged 69. another 70. thatwhich
知识点:语法填空
题型:未分类
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问题详情:下列对诗句分析不正确的一项是()A.“关关雎鸠,在河之洲”两句运用比喻手法,说明淑女、君子在河滩幽会,营造出一种幽静的氛围。B.“参差荇菜”一句反复使用,增强了诗歌的节奏感,也展现了《诗经》回环往复、一唱三叹的特*。C.“悠哉悠哉,辗转反侧”以行动来反映君...
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在下列向量组中,可以把向量表示出来的是( )A B. C. D.
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下列物质中所含氮元素化合价最低的是 A.NO2 B.N2 ...
问题详情:下列物质中所含氮元素化合价最低的是 A.NO2 B.N2 C.NH4Cl D.HNO3【回答】C知识点:各地中考题型:选择题...
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下列各组中,含有离子晶体、分子晶体、原子晶体各一种的是( )A.HCl、H2SO4、S ...
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