Question

       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 treatment center.The scientists put plants in narrow containers (容器) inside a glass building. One end of each container was a little higher than the other end. Waste water was directed down the container through the plants’ thick roots. The roots absorbed the wastes in the water and used them for food. At the same time the plants produced natural gases. The gases could be collected and sold as fuel (燃料) .

       Four places in Florida have used green plants to clean their waste water.

26. 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

27. 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 the container through the plants’ thick roots

   D. the wastes in water are excellent food for plants

28. The technique is called a new way because       .

   A. it is cheaper than any other ways

   B. it can be carried out in a glass building

   C. it makes the waste water clean hut uses no chemicals

   D. it needs only narrow containers and green plants

29. The new technique       .

   A. has come to be widely used in America

   B. is still being tested since its first use

   C. is proved to be more valuable than expected

   D. has come into use in some places of America

30. What is the main idea of this passage?

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

   B. Scientists are able to clean water.

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

   D. New ways of making waste water clean are better than the chemical ones.

Answer 1

26. B  全文圍繞新的廢水處理方法進行說明。

27. D  根據(jù)“...and used them for food."可知選 D。

28. C  根據(jù)文章第一句可知選C。

29. D  根據(jù)最后一句可知，這項新技術(shù)在一些地方已經(jīng)被使用。

30. A  本文主要講了一種用綠色植物處理廢水的新方法。