题目内容:
Which of the following is NOT true according to the text?
A.People had a divided sleep pattern only in the 18th century. A.People had a divided sleep pattern only in the 18th century.
B.Scientists agree that artificial lighting changed the way people sleep.
B.Scientists agree that artificial lighting changed the way people sleep.
C. Someof the people today are not familiar with the practice of divided sleep.
C. Some of the people today are not familiar with the practice of divided sleep.
D.Sleeping for one long period may explain why some people have sleep problems.
D.Sleeping for one long period may explain why some people have sleep problems.
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