单项选择题

The real power of words consists in their______.

A．properties
B．characteristics
C．peculiarity
D．representative function
<上一题 目录 下一题>
热门 试题

单项选择题
Which of the following is NOT an example of artificial selection
A．the selection by a farmer of the best milk-producing cows for breeding
B．a breeder's allowing only the fastest horses to reproduce
C．the selection for reproduction of the best egg-laying chickens by the farmer
D．an increase in the number of giraffes with long necks because of a decline in the number of low-lying plants used for feeding
单项选择题
The main difference between natural and artificial selection is that human beings______.
A．control the direction of artificial selection
B．control the direction of natural selection
C．make new genes in artificial selection
D．make new genes in natural selection
相关试题