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

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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

One may assume from this article that

A．pigs have remained unchanged for centuries
B．pigs are naturally vicious animals
C．pigs make a significant contribution to modem life
D．pigs are better than any other animal for laboratory