单项选择题

What does the passage mainly discuss

A．A method to assist in making complex decisions.
B．A comparison of actual decisions and ideal decisions.
C．Research on how people make decisions.
D．Differences between long-range and short-range decision making.

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单项选择题

The author states that On the average, people can keep about seven ideas in their minds at once to explain that ______.

A．most decisions involve seven steps
B．human mental capacity has limitations
C．some people have difficulty making minor as well as major decisions
D．people can learn to keep more than seven ideas in their minds with practice

单项选择题

The author develops the discussion in paragraph I by means of ______.

A．describing a process
B．classifying types of worksheets
C．providing historical background
D．explaining a theory