The writer makes it obvious that______
A.sleepwalkers are often awakened by dangers
B.the underlying cause of sleepwalking is more serious than sleepwalking itself
C.most sleepwalkers are deranged or insane
D.All of the abov
参考答案:B
解析:文章中作者明确指出,引起梦游的原因远比梦游本身严重。