BIf you have a bottle of water recycled from urine(尿), would you drink it? Astronauts at t

B
If you have a bottle of water recycled from urine(尿), would you drink it? Astronauts at the ISS may soon do so.
NASA（美国航空航天局）said it would see a high-tech machine to recycle wastewater at the ISS. The machine will recycle water for washing hands, shower water, water for brushing teeth and even urine to make drinking water. It will save millions of dollars each year.
At present, each ISS astronaut uses about 4.4 liters of water every day. It costs about 24 million dollars a year to send water up to the ISS. A liter of water costs about $11,000.
The machine will be sent to the ISS later. NASA hopes it will recycle about 93% of all the water used on the station.
Will the water be clean? Different chemicals will be put in the wastewater. The water will be heated to 130℃ to kill bacteria. Scientists say that the recycled water is thousands of times better than the water from a city tap(水龙头).
50. NASA will use a high-tech machine to recycle wastewater at the ISS to     .
A. protect the ISS                            
B. make the astronauts work harder
C. provide better water and food for the astronauts  
D. save the cost of sending water up to the ISS
51. At present it costs NASA about     dollars to transport water up to an astronaut at the ISS a day.
A. 4.4 thousand       B. 11 thousand              C. 48.4 thousand                  D. 24 million
52. The passage mainly tells us something about     .
A. water recycling at the ISS      B. the International Space Station
C. a high-tech machine                D. the cost of NASA
53. Which of the following sentences is TRUE?
A. The recycled water is much better than that from a city tap.
B. The high-tech machine will recycle all the water used on the station
C. The ISS astronauts use more water than us
D. The high-tech machine can only recycle urine to make water50-53 DCAA