A．cancel
B．affect
C．influence
D．damage

A．Canada and the U.S. have functionally illiterate population because they hardly paid any attention to the problem
B．functional .illiteracy may have been caused at least in part by unsuccessful design of reading tests
C．non-English-speaking immigrant population constitute the majority of all the functionally illiterate
D．it is impractical to determine what functional illiteracy really is as different situations set different requirements