单项选择题

What is the main subject of the passage

A．The migration of the blacks to Harlem.
B．The origin of the word "Harlem".
C．Harlem, the symbol for liberty and promised land to the Blacks.
D．The history of black Harlem.

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单项选择题

It can be inferred from the passage that stages of sleep are primarily classified according to ______.

A．breathing rhythms
B．muscular movement
C．dreaming patterns
D．brain wave activity

单项选择题

According to the passage, the alpha rhythm is the characteristic of which phase of sleep

A．Stage 1.
B．Stage 2.
C．Stage 3.
D．Stage 4.