听力原文： Voters in Peru headed to the post today to cast their ballot in a runoff presidential election that many hope will mark the end of the nation's political crisis. Opinion polls last week showed the moderate candidate Alejandro Toledo with a narrow lead over the left-leaning former president Alan Garcia. Both Candidates have campaigned on similar publicity platforms. Meanwhile, pre-lection surveys indicate that up to 25% of voters in Peru plan to spoil or leave their ballot blank to show their dissatisfaction with both candidates. Some voters will waste their ballots because