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
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单项选择题
Which of the following statements is NOT true
A．Members of a species differ from one another.
B．All differences between individuals are inherited.
C．Two organisms with identical genes may grow to different sizes.
D．Not all of the organisms can live to reproduc
单项选择题
It is implied rather than clearly stated in the first paragraph that______.
A．science is concerned about the natural world
B．technology is the result of applied science
C．a scientist is a cultivator of science
D．the scientific method is indispensable in the pursuit of science
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