The c______ period hypothesis refers to a period in one's life extending from about age two to puberty, during which the human brain is most ready to acquire a particular language and language learning can proceed easily, swiftly, and without explici

The c______ period hypothesis refers to a period in one's life extending from about age two to puberty, during which the human brain is most ready to acquire a particular language and language learning can proceed easily, swiftly, and without explicit instruction.

critical。