The College Board says humidity in the air caused the paper to expand and change the position of the answers.It says the problem affected tests with light or incomplete answer marks.

• 大学委员会称空气中的湿度使纸张膨胀，改变了答案的位置，这会对哪些没有全部完成的试卷或写得很轻的试卷的得分产生影响。