单项选择题
Questions 22 to 25 are based on the conversation you have just heard.
A.Finances. B.Equipment. C.Labor. D.Profits.
A.How private languages are developed. B.How people create their languages. C.How different languages are related. D.How children learn to use language.
A.Whether spacemen carry weapons. B.How NASA trains its spacemen. C.How spacesuits protect spacemen. D.What spacemen eat and drink.