The Colorado Parks and Wildlife biologists, therefore, have no option but to remove the fish from the lake in the most efficient manner. The fish will then be fed to injured birds like eagles and osprey.

　　Experts say that most owners believe they are doing the “right thing” by returning their pet to the wilderness. However, saving one pet often results in destroying the area's ecosystem and hurting other animals. According to experts, the best way to dispose_of unwanted fish or any other animal is to get advice from the people that sold the pet.

　　9．Why did the dangerous goldfish appear in Teller Lake?

　　A．They were born into the lake.

　　B．They were thrown by Park officials.

　　C．They were abandoned by their owners.

　　D．They were brought in by some biologists.

　　10．How is the lake's ecosystem likely to be influenced by the goldfish?

　　$来&源：A．Native fish may be eaten by them.

　　B．New diseases may be brought in.

　　C．The lake water may be polluted.

　　D．Food sources may be increased.

　　11．What will happen to the goldfish after

　　they're caught?

　　A．They'll be killed at once.

　　B．They'll become food for birds.

　　C．They'll be set free downstream.

　　D．They'll be raised in the fishbowl.

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