shaped reef islands, as the volcanoes within gradually
eroded and disappeared.
- Which of the following best tells what this passage is about?
(A) the varieties of unusual animal life that live in coral reefs
(B) how coral reefs manage to survive wave erosion
(C) some biological and geological aspects of coral reefs
(D) the physical beauty of coral reefs
(E) the geological origins of reef islands
- The skeleton of the stony coral is mostly made up of what?
(F) cartilage
(G) stone
(H) calcium carbonate
(J) carbon dioxide
(K) sediment
- The relationship between the coral and the algae is best described as
(A) unfriendly.
(B) competitive.
(C) predatory.
(D) cooperative.
(E) mysterious.
- What is the “puzzling” feature of coral reefs discussed in this passage?
(F) their evolution into islands
(G) their ability to support diverse communities of life
(H) the ease with which they withstood the destructive effects of the last Ice Age
(J) their evolution from isolated reefs into great land masses
(K) the frequent appearance of new volcanoes in their vicinity
- Which of the following is mentioned as resulting from volcanic activity?
