题目内容：
请在第__(50)__处填上正确答案。
A．Some people might want to try to learn some of these songs by heart. B．Papua New Guinea is an extremely rich source of different languages, but more than 100 of them are in danger of extinction( 灭绝 ).
C．However, he was a frequent visitor to the Catawba reservation in South Carcinoma where he learned the language.
D．These language don't have many native speakers.
E．For the rest of us, when a language dies, we lose the possibility of a unique way of seeing and describing the world.
F．As these language become more powerful, their use as tools of business and culture increase.
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