单项选择题

Human beings differ from animals because they can

A．adapt to their environment.
B．control their environment.
C．adapt the environment to their need.
D．observe and understand their environment.
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单项选择题
By using the example of Galileo, the author intends to reveal that
A．objectivity is essential to scientific research.
B．hypothesis is based on careful observation.
C．creativeness plays an important part in scientific research.
D．observation is the only factor determining scientific research.
单项选择题
On the basis of their observations, scientists
A．make more observations.
B．develop hypothesis and theories.
C．reveal their observations to the public.
D．challenge their colleagues.
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