检眼镜可用于检查（）
A.视网膜
B.巩膜
C.视神经
D.结膜
E.玻璃体
参考答案：A, C, E
当洪水涨、落急剧，洪峰历时短暂，不能用均匀浮标法测流时，可用（）法测流。
A.中泓浮标
B.深水浮标
C.浮杆
D.漂浮物
The boys were promised a good future before they were taken abroad.
