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.<br>You will hear five persons talking about different things. Decide the subject of their talk by the speaker.<br>Write one letter(A-H)next to the number of the recording.<br>Do not use any letter more than once.<br>After you have listened once, replay each recording.<br>You have 15 seconds to read the list of reasons A-H
A. fitness
B. oil pollution
C. advertisement
D. census
E. laboratory work
F. sports
G. transportation system
H. fashion model