单项选择题

A．factor
B．element
C．component
D．atom
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单项选择题
Which of the following is TRUE about the urban people of Western Canada during the early years of this century
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
This text indicates that the basic component of scientific research is ______.
A．observation
B．hypothesis
C．reasoning
D．interpretation
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