28. (1) Other gardeners have adopted a system called xeriscaping.
(2) The approach aims to make the most of available water and sunlight in a self-sustaining way by
recycling materials.
(3) In California, water shortages caused by over-use are so acute that some gardeners have resorted to
dyeing their lawns green.
(4) The system involves grouping plants according to their watering needs and concentrating on
drought-tolerant plants.
(5) In Australia, however, another system called permaculture was pioneered by Bill Mollison.
(A) 31452 (B) 13452 (C) 21543 (D) 54321
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