填空题

In the solar system, Earth is made out of different matter from other planets.

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N
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单项选择题
According to decision-worksheet theory, an optimal decision is defined as one that ______.
A．has the fewest variables to consider
B．uses the most decision worksheets
C．has the most points assigned to it
D．is agreed to by the greatest number of people
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
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