Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits
Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 13 to 17.
CORAL REEFS
Coral reefs are structures of hard rock (13) _______. They are formed by corals, small plant-like animals that live in large groups. Coral reefs are home to an amazing variety of plants and fish. Indeed, coral reefs are so rich in color and variety that they have been (14) _______ . Sadly, just like rainforests, coral reefs are under threat from human activities. Climate change, overfishing, and ocean pollution are causing damage to coral reefs all over the world. (15) _______. Already, scientists estimate that 10% of the world's coral reefs no longer exist, and an incredible 60% are endangered. The problem (16)_______ to changes in water temperature. Climate change, which is expected to significantly raise water temperatures in the next few decades, could cause serious (17) _______ to the world's coral reefs. There are a number of things you can do to help protect coral reefs. They are among the most beautiful ecosystems in the world, and it's up to us to save them!
Đáp án đúng là: B
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Đáp án cần chọn là: B
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