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
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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
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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