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【单选题】
城市社会学收集资料方法中，（）是现在用得最多的一种方法，具有许多优点。A.
访谈法
B.
问卷法
C.
观察法
D.
文件法
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【单选题】You could identify an unknown bacterium by all of the following except
A.
hybridizing a DNA probe from a known bacterium with the unknown's DN
B.
making a fatty acid profile of the unknown.
C.
specific antiserum agglutinating the unknown.
D.
ribosomal RNA sequencing.
E.
percentage of guanine + cytosine.
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【单选题】When you identify the particular research problem under investigation, you could mention ________.
A.
the purpose of the study
B.
the specific research objective
C.
the research hypothesis
D.
All of the above .
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