Provides a contemporary Government-and-Binding reinterpretation and evaluation of Klima and Bellugi's 1966 work on the acquisition of interrogatives. It is argued that wh-questions in Child English involve a wh-pronoun positioned in the head complementizer position within the Complementizer Phrase (CP) and that children learn that wh-questions involve a wh-phrase superficially positioned in the specifier position within CP. (Contains 36 references.) (JP)