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
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单项选择题
Which of the following is the most suitable title for this passage
A．Bears and bulls
B．The domestication of bears
C．Phrases and animals
D．Bullfighting
单项选择题
Which institution has offered $ 4.7 million to fund the research
A．The US' s National Institute of Science and Technology.
B．Origen therapeutics of Burlingame, California.
C．Embrex of North Carolina.
D．Animal welfare groups.
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