题目内容
（请给出正确答案）
A、Correlation research
B、Descriptive study
C、Analytical research
D、Experimental study
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A、functional shift
B、semantic shift
C、lexical change
D、functional drift
A、Its tail
B、Its teeth
C、The shape of its skull
D、Details of its bone structure
A、Site investigation
B、Stability of natural and man-made slopes
C、Risks assessment posed by site conditions
D、Design of earthworks and structure foundations
A、Admission rate bias
B、Prevalence-incidence bias
C、Lost to follow-up bias
D、No response bias
A、All of them need to be given artificial intervention.
B、All of them need to set up a control group.
C、It is based on the research methods of cause and effect.
D、May lead to lost to follow-up bias.
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