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¡¾ÌâÄ¿¡¿American researchers have successfully developed a way to clean waste water without chemicals. The technique uses green plants. The tests were carried out at a waste water treatment centre. The scientists put plants in narrow containers inside a glass building. One end of each container was a little bigger than the other end. Waste water was directed down the container through the plants' thick roots which absorbed the wastes in the water and used them for food. At the same time the plants produced natural gas.The gas could be collected and sold as fuel. Four places in Florida are using green plants to clean their waste water.

¡¾1¡¿The best title for this passage is______.

A. The Success of American Scientists

B. A New Way to Treat Waste Water

C. Waste Water and Green Plants

D. Advanced Technology in America

¡¾2¡¿The technique to clean waste water is based on the fact that ______.

A. green plants can be put in narrow containers

B. most green plants have thick roots

C. water can be directed down through the plants' thick roots

D. the wastes in water can be food for plants

¡¾3¡¿The technique is called a new way because ______.

A. it is cheaper than any other one

B. it can be carried out in a glass building

C. it makes waste water clean but uses no chemicals

D. it needs only narrow containers and green plants

¡¾4¡¿The new technique ______.

A. has been widely used in America

B. is still being tested since its first use

C. proves to be more valuable than expected

D. has now come into use in some places of America

¡¾5¡¿What is the main idea of this passage?

A. Green plants are successfully used to clean waste water.

B. Scientists are able to clean waste water.

C. Green plants have been used to clean waste water in Florida.

D. New ways of making waste water clean are better than ways of using chemicals.

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