某胃癌筛检试验的测定结果，见表1。
试验的灵敏度为（）
A.25%
B.50%
C.60%
D.70%
E.80%
参考答案：C
两个角互为补角，那么这两个角大小[ ]
A.都是锐角
B.都是钝角
C.一个锐角，一个钝角
D.无法确定
The differences between male and female brains are the major causes of the scores between boys and girls.
