You are going to hear a passage three times. Listen carefully and fill in the missing information 1 to 8.音频6注意:如果一题多空,请用空格分隔答案。 Culture NotesThe critical period hypothesis (假说) is the subject of debate in linguistics and language acquisition.The hypothesis claims that there is an (1)________time window to acquire language in a linguistically rich environment, after which further language acquisition becomes much more difficult and effortful.