写出一个2与4之间的无理数：______．
3到4之间的无理数5，π，10．
答案不唯一．
We looked at each other _____ fear when the earthquake started? [ ]
A. in
B. on
C. at
D. for
应用眼专业超声诊断可探测（）①视网膜剥离；②玻璃体出血；③视神经异常
A.①+②+③
B.①+③
C.①
D.①+②
