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______
A. It is a sign of human intelligence.
B. It improves with constant practice.
C. It is something we are born with.
D. It varies from person to person.
______
A. How private languages are developed
B. How different languages are related.
C. How people create their languages.
D. How children learn to use language.
______
A. Basing them on science-fiction movies.
B. Including interesting examples in them.
C. Adjusting them to different audiences.
D. Focusing on the latest progress in space science.
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