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
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
According to the context, the simple reading done by the computer mostly refers to ______.
A．reading in search of intended information only
B．looking for unexpected information only
C．reading to locate texts to be used in teaching
D．reading to set up superior master indexes
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