单项选择题

Which of the following represents the ratio of the hours teenagers spend on Work/School to the hours teenagers spend on all activities（）

A．17:24
B．7:17
C．7:24
D．24:17
E． 24:7

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单项选择题

The author’s argument is developed primarily by the use of（）

A．an attack on poorly constructed sleep research studies
B．a critique of recent scientific studies on REM-sleep
C．a warning against getting too little sleep
D．an analogy between human and non-human sleep processes
E．an overview of specific processes that may occur during different stages of sleep in humans

单项选择题

Directions for Quantitative Comparison Questions: Some of the following questions give you two quantities, one in Column A and one in Column B, Compare the two quantities and choose one of the following answer choices:（）

A．if the quantity in Column A is greater;
B．if the quantity in column B is greater;
C．if the two quantities are equal;
D．if you cannot determine the relationship based on the given information