单项选择题

His sudden ________greatly surprised all of us as he was always a very kind man.

A．unhappiness
B．heartiness
C．harshness
D．uprightness
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单项选择题
What is most probably the key point discussed immediately before this passage
A．Limited time.
B．Making choices.
C．Opportunity cost.
D．The shortage of resources.
单项选择题
According to the passage, economists define opportunity cost as ________ .
A．an opportunity given up in terms of cash
B．the cost of a better choice measured in terms of cash
C．giving up a specific choice for the next best alternative
D．the cost of a specific choice measured in terms of any alternative choice
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