单项选择题

The encouragement of children to achieve new skills ______.

A．can never be taken too far
B．should be left to school teachers
C．will always assist their development
D．should be balanced between two extremes
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单项选择题
Which of the following contributes to the low-cost of using rainwater
A．Rainwater is free of chemical treatments.
B．People have been harvesting rainwater for centuries.
C．The water harvesting system is built on a platform.
D．Rainwater can be collected using pipes.
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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