Dr. Paul Johnson, who discovered the Washington reef in 2007, also found other surprises such as bubbles of methane(甲烷) gas flowing out of the seafloor nearby. The methane feeds bacteria, and the bacteria feed the glass sponges.

　　“It’s a new ecosystem we know nothing about,” said Dr. Johnson.

　　The reef of yellow and orange glass sponges is crowded with crabs, shrimp, starfish, worms, snails, and rockfish. The glass reef is also a nursery for the babies of many of these creatures and was called a “kindergarten” by scientists.

　　Many animals that live in the reef hang around for a long time, just like the sponges. Rockfish, for example, live for more than 100 years. Scientists are just beginning to study all the species that call the reef home.

　　The Washington coast isn’t the only place where a living glass reef has been found. The first was discovered in Hecate Strait off the coast of British Columbia in 1991. Scientists all over the world were stunned to see it.

　　26. Which of the following is the best title for the passage?

　　A. Man-made cities under the sea

　　B. The world under the sea

　　C. Glass “cities” under the sea

　　D. Creatures under the sea

　　27. It can be learned that the glass reef _______.

　　A. is made up of a kind of materials called sponges

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