The author seems to indicate that___________.A、there are many controversial issues like the right amount of sleep
B、people are now moving towards solving many controversial issues
C、among many issues the right amount of sleep is the least controversial
D、the right amount of sleep is a topic of much controversy among scientists
【正确答案】：D
【题目解析】：题目问的是作者意在指明___________。根据第一段的第一句话There must be few questions on which responsible opinion is so utterly divided as on that of how much sleep we ought to have.可知，围绕"我们大概需要多少睡眠"这个问题，不同的意见分为相反的两种。因此选择D. the right amount of sleep is a topic of much controversy among scientists（人们需要多少睡眠是科学界充满争议的话题）。