79 -According to the passage, the piranha ---- .
A) is the world's smallest fish
B) would not be so bad if it was better understood
C) has sharp teeth and a large appetite
D) lives largely on a diet of its own species
E) is a salt water fish, similar to the shark
80 -The passage tells us that ----- .
A) piranhas are dangerous because so many of them gather to attack their prey
B) a single piranha can eat a cow in a matter of minutes
C) the average piranha eats four other piranhas every day
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