試題詳解

53. A small island has stable populations of plants and animals, including one species of hawk as the only predator. A ship docks at the island, and the ship's cat has recently had a litter of kittens. One of the young cats accidentally goes ashore in a small boat, jumps to land and runs into the brush. No one notices, and they leave the cat on the island. What do you think is a likely consequence of the cat's presence on the island?
(A) The insect populations will decline.
(B) The fish in the lagoon will decrease due to predation.
(C) It's only one cat and will make no difference to the island.
(D) Some species of ground-nesting birds may go extinct within a few years.
(E) The increase in nitrogenous waste from the cat will increase the size of many plants.