单项选择题

It is implied in the last paragraph that ______.

A．bulls and bears are now working for people
B．people keep bears and bulls as their pets
C．laws have put stock markets under control
D．people can enjoy the, if friendship with bears and bulls

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单项选择题

It can be inferred from the passage that a bear is going to gain money if ______.

A．the stock price is rising
B．the stock price is dropping
C．the bulls are withdrawing
D．other bears are losing money

单项选择题

According to tile passage, we know that bulls, bears, and bubbles has a history of about ______.

A．200 years
B．250 years
C．375 years
D．280 years