题目

 阅读理解More than a third of the world's population lives in dry lands. Scientists at the University of Texas at Austin have developed a unique solution to help people in these areas access clean drinking water.They have developed a special gel (凝胶) that can pull water from the air in even the driest climate. Combining two simple ingredients, cellulose and konjac gum (树胶), the gel is inexpensive to produce. Just one kilogram of gel can absorb up to six liters of water in a dry climate. For those living in a climate with relative humidity (潮湿), one kilogram of gel can collect up to 13 liters of water a day. As the gel is so inexpensive and easy to make, it may offer a way of providing drinking water to countries with water shortages.Previously, researchers have harvested fresh water from fog and dew, but that only serves areas with high humidity. Other attempts at pulling water from desert air are typically energy-intensive and do not produce much. In fact, this gel is a vast improvement from previous water harvesting technologies. This new gel uses no energy and is simple to operate and it can be molded into a shape or size that best suits the user."This new work is about practical solutions that people can use to get water in the hottest, driest places on Earth," said Guihua Yu, professor at the Cockrell School of Engineering. "This could allow millions of people without consistent access to drinking water to have simple, water generating devices at home that they can easily operate."Scientists are planning on making a thicker gel that will increase the yield making this technology a practicable solution to drought. （1） What do we know about the gel from paragraph 2? A . It can increase the humidity of the air. B . It has been widely applied in desert areas. C . It can collect drinking water from the air. D . It costs lots of money and energy to produce. （2） Why does the author mention previous water harvesting methods in paragraph 3? A . To prove the advantages of the new gel. B . To state the process of manufacturing the new gel. C .  To show the tough living conditions in dry regions. D . To present the theory of water harvesting technologies. （3） What is Guihua Yu's attitude towards the gel? A . Objective. B . Negative. C . Sensitive. D . Positive. （4） What will scientists intend to do next? A . Produce the gel on a large scale. B . Develop the function of the gel. C . Raise money for further research. D . Teach people to make the gel at home. 答案： C A D B

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