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A．To win medals.
B．To break world records.
C．To win first places.
D．To take part in the Games.
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单项选择题A．They paid no special attention to information about the production and the price of wheat.B．They might casually take the growing of wheat as a topic of conversation.C．They also grew wheat in their backyards.D．They were as much concerned with the wheat production and selling as the farmers.

A．They paid no special attention to information about the production and the price of wheat.
B．They might casually take the growing of wheat as a topic of conversation.
C．They also grew wheat in their backyards.
D．They were as much concerned with the wheat production and selling as the farmers.

单项选择题What does the fourth paragraph imply

A．It's of significance to make different reactions to the same things.
B．Scientific research is unreliable owing to the different observations.
C．People try their best to make impartial observation.
D．The way of observation varies from person to person.

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 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