Inventor Jonathan Ritchey said:“The demand for water is off the chart.People are looking
for freedom from water distribution systems that are shaky and unreliable”.
The machine,which is about 3 feet wide,is likely to cost£800 when it goes on sale here in the spring.Its maker, Canadian firm Element Four, estimates(估计)that a liter of water will cost around 20 pence to produce.
Environmentalists claim half the world’s population will face water shortage because of climate change by 2080.One in five humans is said to lack access to safe drinking water.
The Water Mill is not effective in areas with below about 30 percent relative humidity, but with average relative humidity in England of more than 70 percent that won’t be much of an issue here.
45.According to the author, the biggest advantage of the machine is its
.
A.little power use
B.proper size C.unlimited source D.high production
46.We can conclude from the passage that the machine
.
A.can be used everywhere
B.has not been on sale
C.will replace the water distribution system
D.will solve the problem of water shortage
47.What is necessary for the machine to work?
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