A. about 1,200

　　B. about 1,750

　　C. about 4,500

　　D. 10,343

　　62. What is the main idea of the second paragraph?

　　A. The causes of the increasing bird strike incidents.

　　B. The causes of larger populations of birds at airports.

　　C. The problems caused by more flights at the airports.

　　D. The rising number of Canada geese in North America.63. Pyrotechnics is used to drive the birds away by ______.

　　A. producing much smoke

　　B. eating up birds' eggs

　　C. copying the dog's barks

　　D. making very loud noises

　　64. We can infer that the egrets, herons and moorhens are ______.

　　A. fireworks

　　B. dogs

　　C. birds

　　D. pigs

　　65. When do the migrating gulls probably return to their island habitat near the airport?

　　A. In March.

　　B. In July.

　　C. In October.

　　D. In December.

　　C

　　Polar bears are dying out! They are dying because they are losing a great deal of habitat due to human incursion(侵入) and global warming. They are dying because of starvation as well. With the sea ice they depend on for survival shrinking(缩小), it is becoming increasingly difficult for them to find food.

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