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  3. Obtaining Drinking Water from Air Humidity Not a plant to be seen，the desert ground is too dry．But the air contains water，an

Obtaining Drinking Water from Air Humidity Not a plant to be seen，the desert ground is too dry．But the air contains water，an

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问题                  Obtaining Drinking Water from Air Humidity
    Not a plant to be seen，the desert ground is too dry．But the air contains water，and research scientists have found a【51】______of obtaining drinking water from air humidity．
    “The process we have developed is based exclusively on renewable energy sources【52】______thermal solar collectors and photovoltaic(光电的)cells，【53】______makes this method completely energy autonomous．It will【54】______function in regions where there is no electrical infrastructure(基础设施)，”says Siegfried Egner，head of the research team．The principle of the【55】______is as follows：hygroscopic(吸湿的)brine(盐水)，-saline(含盐的)solution which absorbs moisture-runs down a tower shaped unit and absorbs water from the air．It is then sucked【56】______a tank a few meters off the ground in which a vacuum prevails．Energy from solar collectors【57】______up the brine，which is diluted by the water it has【58】______．
    Because of the vacuum，the boiling point of the liquid is lower than it would be under【59】______atmospheric pressure．The evaporated(蒸发的)，non-saline water is condensed and runs down through a completely filled tube in a controlled manner．The gravity of this water column【60】______produces the vacuum and SO a vacuum pump is not needed．The reconcentrated brine【61】______down the tower surface again to absorb moisture from the air．
    “The concept is suitable for various water【62】______．Single-person units and plants supplying water to entire hotels are conceivable，”says Egner．Prototypes have been built for【63】______system components-air moisture absorption and vacuum evaporation-and the research scientists have already【64】______their interplay on a laboratory scale．In a further【65】______the researchers intend to develop a demonstration facility．
选项 A、instrument
B、step
C、case
D、ground
答案B
解析 根据上下文可知，此句是说，“在下一步的研究中，科学家们会开发出一套用于展示的设备。”故选B。
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