大学生学习适应不良容易造成心理困惑。
参考答案：对
Only after Mary read her composition the second time __________ the spelling mistake.
A．did she notice
B．she noticed
C．does she notice
D．she has noticed
评价筛检收益的主要指标是（）
A.灵敏度
B.特异度
C.正确指数
D.预测值
E.阳性预测值
