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閱讀短文，根據短文內容，從短文后的五個選項中選出能填入空白處的最佳選項。選項中有一項為多余選項。
       Dr.Jack Todd is very interested in clean water .  1   ,so it's natural that he is to developer of a smal
l and affordable system(系統)to clean wastewater,His "Living  Machine" can clean wastewater in your
home or in your business. 
         2   The wastewater goes into a big plastic tank where bacteria(細菌)start to break down the waste.A few days later after it is dealt with, the water is brought into a greenhouse filled with plants and fish.
With the help of sunlight,the plants and animals remove more chemicals from the water,making it cleaner,
Then the water can be reused for washing or bathing   3   but the water is clean enough for watering the
flowing, washing the dog, or even for bathing or swimming.
       The advantage of this technology is that it is affordable and good for the environment.   4   It can help
to use less fresh water, and it can help keep the water supply unpolluted.
A. If enough homes and businesses use "Living Machines"
B. People like to plant trees around their houses
C. He is also interested in saving money
D. It cannot be used for drinking or cooking
E. The "Living Machine" is a system for cleaning wastewater
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