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{{U}}
(51) {{/U}}of obtaining drinking water from air humidity.
“The process we have developed is based exclusively on renewable energy
sources{{U}} (52) {{/U}}thermal solar collectors and
photovoltaic(光电的)cells,{{U}} (53) {{/U}}makes this method completely
energy autonomous.It will{{U}} (54) {{/U}}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{{U}} (55) {{/U}}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 A. who B. where C. when D. which
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{{B}}Staying Active
in Old Age Keeps People Mobile{{/B}} People over 70 who aren’t
active are more likely to develop problems walking or climbing stairs within a
few years, according to a new study. These findings suggest that
it’s very important to stay______(51) in old age, study author Dr. Marjolein
Visser told Reuters Health. "Physical activity in old age is as
important______(52) taking your medications (药物)," Visser noted. "You do not
need to join an expensive, fancy sports club with high-tech (高科技的) equipment.
Your body will already______(53) from regular walking." Visser,
a Dutch (荷兰的) scholar, explained that______(54) active helps prevent people from
becoming breathless during simple activities, increase muscle mass and strength,
and maintain the A. rarely B. openly C. exactly D. regularly
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