15．
Water is a limited natural resource that must be protected； it is limited in many places．Even if you live in an area with enough rainfall，using water uses energy to process（加工） it．Here are some tips on saving water at home．
•Install a water meter（安裝水表）．
You might be very surprised to find out how much water you are actually using．By installing a water meter you can raise your attention so that you will reduce your water use．
Many water meters have a small wheel that turns quite rapidly if any water at all is running．If you are sure all your water is turned off and you see this wheel moving at all，you have a leak（漏水）．
•Take shorter showers．
Take showers rather than baths．By taking a bath you are using up to 100liters of water!Showering will generally use less than a third of this amount．
•Catch the cold water that comes out of the tap or shower while you are waiting for the hot water．
Use it to water plants or pour into your toilet reservoir．
•Turn the tap off while you are brushing your teeth，shaving，washing your hands，doing dishes，and so on．
Turn the tap off when you shower，too．Get wet，then turn off the water while you
soap up．Turn it back on for long enough to wash．Look for a twist vale that is installed behind your shower head to keep the water temperature where you set it while the water is off．
•Wash full loads．
Wait until you have a full load of clothes before you wash a load．Don't wash a pair of pants just because you want to wear the same pair of pants the next day!When washing your clothes，be sure to use the economy mode and this will save you both water and electricity!
48．If you install a water meter，you canD．
A．keep the water running
B．stop the water running
C．save both water and electricity
D．raise attention to use less water
49．By taking a shower you can save aboutBwater．
A.30liters
B.60liters
C.100liters
D.300liters
50．Which of the following statements is true according to the passage？B
A．You have a leak if the wheel of the water meter is moving．
B．You should wait to have as many clothes as possible before washing．
C．When showering，you should soap up while the water keeps running．
D．You are encouraged to use more water in the area with enough rainfall．
51．The writer writes this passage toD．
A．explain to us how valuable water is
B．tell us the ways of using water at home
C．a(chǎn)sk us to do what he says in the passage
D．give us some advice on saving water at home．
