单项选择题

Passage Three

A. Memory.
B. Two kinds of memory.
C. Short-term memory.
D. An experiment on students.
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单项选择题
What is the main purpose of the passage（）

A. To outline contrasting types of economic systems.
B. To explain the science of economics.
C. To argue for the superiority of one economic system.
D. To compare barter and money-exchange markets.
单项选择题
A. A person should probably be the least afraid of a dwarf shark. B. A person should probably be the least afraid of a tiger shark. C. A person should probably be the least afraid of a bull shark. D. A person should probably be the least afraid of a great white shark.
A. A person should probably be the least afraid of a dwarf shark.
B. A person should probably be the least afraid of a tiger shark.
C. A person should probably be the least afraid of a bull shark.
D. A person should probably be the least afraid of a great white shark.
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