Itisnotasecret61. treesarevitaltoourlife.Theyprovide...
問題詳情:
It is not a secret 61. trees are vital to our life. They provide us with food, wood and most 62. (important), 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 64. (consist) of scientists from the Massachusetts Institute of Technology (MIT) and high school students
65. were seeking a natural water filter(過濾)—one that would help communities in developing countries that do not have 66. (accessible) to modern water filter systems.
The 67. (research), led by Professor Rohit Karnik, decided to turn68._______ trees for help, because 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. To their 69. (amaze), they found that it was effective in trapping all the particles. Greatly 70. (encourage), the team conducted another experiment, this time with water that contained bacteria. Sure enough, the sapwood held back 99% of the bacteria, allowing only 1% to flow through.
【回答】
61. that
62. importantly
63. was made
64. consisting
65. who/that
66. access
67. researchers
68. to
69. amazement
70. encouraged
知識點:語法填空
題型:未分類
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