单选题
[2010.04]Experts have found that normal sleep can be divided into five ______ stages.
A.moderate
B.initial
C.distinct
D.advanced
正确答案：C
答案解析：【译文】专家们已经发现正常的睡眠可以分为五个不同的阶段。【试题分析】本题考查词汇。【详细解答】形容词的词义选取。