A. Ice has been extremely polluted.
B. Air temperature has become unbearably colder.
C. Sea ice has been greatly reduced.
D. The number of fish has rapidly disappeared.
C
Dẫn chứng: In the Arctic, global warming is causing the ice to melt slightly earlier and form slightly later. This results in a shorter feeding season for the polar bear.
Đáp án đúng: C. Sea ice has been greatly reduced.
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