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

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

单项选择题

With the technology of freezing stem cells from different strains of chicken, ______.

A．chicken farmers can order certain strains of chicken for economic reasons
B．origen can hardly supply all the strains of chicken the market might need
C．chicken farmers can order certain strains of chicken only
D．origen can be supplied with whatever strain they need