C)To help the residents in times of emergency

　　D)To enable the police to take prompt action

　　29 A)Popular

　　B)discouraging

　　C)effective

　　D)controversial

　　Passage Two

　　30 A)people differ greatly in their ability to communicate

　　B)there are numerous languages in existence

　　C)Most public languages are inherently vague

　　D)Big gaps exist between private and public languages

　　31 A)it is a sign of human intelligence

　　B)in improves with constant practice

　　C)it is something we are born with

　　D)it varies from person to person

　　32 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

　　Passage Three

　　33 A)she was a tailor

　　B)she was an engineer

　　C)she was an educator

　　D)she was a public speaker

　　34.

　　A)Basing them on science-fiction movies.

　　B) Including interesting examples in them

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