听力原文：It showed a population of 1，008，175，288，or one-quarter of the human race．There was a nineteen-point questionnaire to complete，and with the help of twenty-nine computers the information was broken into categories such as age，occupation and marital status． You will hear five persons talking about different things. Decide the subject of their talk by the speaker. Write one letter(A-H)next to the number of the recording. Do not use any letter more than once. After you have listened once, replay each recording. You have 15 seconds to read the list of reasons A-H