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

Some anatomical features of a pig are similar to those of a human. Therefore ______.

A．pigs can live as long as people
B．pigs are becoming popular as movie and TV stars
C．medical research on pigs help humans
D．pigs and people naturally get fat

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