单项选择题

People in Bangladesh can use ______ as a safe source of drinking water.

A．ground water
B．rainwater
C．drinking water
D．fresh water
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单项选择题
Which of the following actually prevents dirt and leaves from falling inside the tank
A．a barrier
B．a wire screen
C．a first-flush
D．a storage tank
单项选择题
What should be done to prevent insects from eating into the water harvesting system at the bottom
A．The two bags holding the water should be put inside the metal tank.
B．The inner bags need to be replaced every two years.
C．The water harvesting system should be built on a platform.
D．A cover should be used to prevent insects from eating it.
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