单项选择题

It is implied in the last paragraph that the method used by earlier ethnographers was ______.

A．detailed note-taking
B．random selection
C．tape-recording
D．on-the-spot investigation
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单项选择题
The ethnographer shows great interest in all of the following EXCEPT ______.
A．current conditions that exist with a culture
B．individual behavior as shaped by a custom
C．behavior patterns common among members of a culture
D．differences existing within a culture
单项选择题
The author asserts that scientists ______.
A．shouldn't replace "scientific method" with imaginative thought
B．shouldn't neglect to speculate on unpredictable things
C．should write more concise reports for technical journals
D．should be confident about their research findings
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