19. What is this passage mainly about?
A) The use of coral in the construction industry.
B) The wonder of coral reefs, and their threats.
C) The kinds of fish found near coral reefs.
D) The underwater world in general.
20. Which statement about coral reefs is
NOT true?
A) They are an important source of fish.
B) They are the world’s most colorful places.
C) They are usually found in deep ocean
waters.
D) They can be larger than structures made by
people.
21. The material commonly called coral is
made of … .
A) shells B) polyps C) reefs D) stone
22. Which sentence best expresses the main
idea of the final paragraph?
A) Coral polyps and reefs are in little danger
and don’t really need our help.
B) Coral polyps are strong, and with our help
reefs will continue to survive.
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