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

　　C) Adjusting them to different audiences

　　D) Focusing on the latest progress in space science

　　35.A) Whether spacemen carry weapons

　　B) How spacesuits protect spacemen

　　C) How NASA trains its spacemen

　　D) What spacemen cat and drink