单项选择题


A．changing
B．diverse
C．variable
D．deviant
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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
单项选择题
The word extract in paragraph 2, sentence 2 is closest in meaning to ______.
A．essence
B．addition
C．selection
D．supplement
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