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

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热门试题

单项选择题

Regarded as a kind of art form, toys ______.

A．follow a direct line of ascent
B．also appeal greatly to adults
C．are not characterized by technological progress
D．reflect the pace of social progress

单项选择题

One aspect of the universality of toys lies in the fact that ______.

A．technological advances have greatly improved the durability of toys
B．the improvement of craftsmanship in making toys depends on the efforts of universities
C．the exploration of the universe has led to the creation of new kinds of toys
D．the basic characteristics of toys are the same over the world