It is normally assumed that, by the age of f______,with an operating vocabulary of more than 2,000 words, children have completed the greater part of the language acquisition process.
【正确答案】：five(P257)解析:到儿童5岁的时候,由于他们大多已掌握了2000多个词汇,事实上他们已经完成了语言习得的大部分课程。
