单选题
We often take a stroll in the park after dinner for about an hour.
A. walk
B. rest
C. bath
D. breath
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It is absurdto predict that the sun will not rise tomorrow（）The original experiment cannot be exactly duplicated.In World War II,the Soviet government allocated important resources.The conference wash hailed as a great success.Take vigorous exercise for several hours a week.共用题干
Obtaining Drinking Water from Air Humidity<br><br>Not a plant to be seen,the desert ground is too dry.But the air contains water,and research scientists<br>have found a. __________<br>(51)of obtaining drinking water from air humidity."The process we have <br>developed is based exclusively on renewable energy sources_________(52)thermal solar collectors and<br>photovoltaic（光电的）cells , ________( 53 ) makes this method completely energy-autonomous. It will <br>____________( 54 ) function in regions where there is no electrical infrastructure（基础设施）,"says Siegfried <br>Egner,head of the research team. The principle of the_________(55)is as follows:hygroscopic（吸湿的） <br>brine（盐水）一saline（含盐的）solution which absorbs moisture一runs down a tower-shaped unit and absorbs <br>water from the air. It is then sucked__________(56)a tank a few meters off the ground in which a vacuum <br>prevails.Energy from solar collectors_________(57)up the brine,which is diluted by the water it has<br>__________ (58).<br>Because of the vacuum,the boiling point of the liquid is lower than it would be under__________(59) <br>atmospheric pressure. The evaporated (蒸发的）, non-saline water is condensed and runs down through a <br>completely filled tube in a controlled manner. The gravity of this water column_______(60)produces the <br>vacuum and so a vacuum pump is not needed.The reconcentrated brine________(61)down the tower <br>surface again to absorb moisture from the air.<br>"The concept is suitable for various water________(62).Single一person units and plants<br>supplying water to entire hotels are conceivable,"says Egner. Prototypes have been built for_______<br>(63)system components一air moisture absorption and vacuum evaporation一and the research scientists<br>have already __________(64)their interplay on a laboratory scale.In a further ________(65)the re- <br>searchers intend to develop a demonstration facility.France has kept intimate bond with its former African territories.Reading the job ad,he wondered whether he was eligible to apply for it.He has been granted asylum in France.The use of wrong medicine may present a hazard to the patients.