单项选择题

This text indicates that the basic component of scientific research is ______.

A．observation
B．hypothesis
C．reasoning
D．interpretation
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单项选择题
On the basis of their observations, scientists ______.
A．make more observations
B．develop hypotheses and theories,
C．reveal their observations to the public
D．challenge their colleagues
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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