In Hudson Bay, the ice breaks up three weeks earlier in the spring now than it did 20 years ago. Polar bears on Hudson Bay fast（绝食） during the summer, waiting for ice to form in the fall to hunt. Every year, the summer gets longer, and the bears get skinnier. Over the past 25 years, the average weight of the female bears has dropped 68 kg. This loss affects their ability to reproduce, and already the number of births has dropped 15 percent. Unless the bears can learn to survive these climate changes, these giants of the ice may one day disappear.

　　48. What is Arctic ice doing earlier each year?

　　A. It’s freezing.

　　B. It’s hardening.

　　C. It’s melting.

　　D. It’s expanding.

　　49. What is true of polar bears that are spending more time on land in Alaska?

　　A. Their young are dying.

　　B. Their diet is changing.

　　C. Their health is improving.

　　D. Their families are growing.

　　50. What do polar bears in Hudson Bay do during the summer?[

　　A. They claim territory(地域).

　　B. They protect mates.

　　C. They hunt animals.

　　D. They stop feeding

　　51. In which publication would you most likely find this passage?

　　A. Medical News

　　B. Society Today

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