单项选择题

According to the above article ______.

A．to be like a pig is to be "piggish"
B．immunization of pigs is commonplace
C．eating pork is unhealthy
D．pet owners would never think of eating their pigs

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单项选择题

The expression hog-wild means ______.

A．untamed
B．unclean
C．untouch
D．untrue

单项选择题

The author of this article maintains ______.

A．pigs are not very intelligent
B．the owners of pet pigs have their own society
C．pigs can never be popular
D．pigs live short lives because of their diet