单项选择题


A．copied
B．developed
C．found
D．learned
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单项选择题
A．changingB．diverseC．variableD．deviant
A．changing
B．diverse
C．variable
D．deviant
单项选择题
Results of the experiment indicated that ______.
A．patients treated with venom were stung less frequently
B．immunotherapy was effective for all patients
C．immunization took place in 7 out of 12 patients
D．the traditional treatment was as effective as the placebo
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