题目内容：
Whatis the main purpose of Paragraph 2-4?
A． To explainwhat happens in a night of divided sleep. A．To explain what happens in a night of divided sleep.
B． Togive an opinion about the divided sleep pattern.
B． To give an opinion about the divided sleep pattern.
C． Todescribe the life of farmers before the 18th century.
C． To describe the life of farmers before the 18th century.
D． Toexplain the lives of writers and artists before the 18th century.
D． To explain the lives of writers and artists before the 18th century.
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答案解析：