题目内容：
According to the passage, which of the following statements is TRUE?
A．Starving polar bears are increasingly coming into villages, where they may be killed eitherfor food or safety. B．Polar bears can spend their entire lives on land if the sea ice melts completely.
C．Two-thirds of the world' s polar bears may disappear by 2050 as global warming continues.
D．The growing distance between ice packs is not a problem for polar bears, because they areexcellent swimmers.
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