第一部分 阅读理解（共两节，满分40分）
第一节 （共15小题；每小题2分，满分30分）
A
Can you imagine that a small stamp should be worth $16,800?
Any mistake made in the printing of a stamp raises its value to stamp collectors. A mistake on a two-penny stamp has made it worth a million and a half times its face value.
