单项选择题

According to the researchers, the traditional treatment for bee stings is ______.

A．widespread
B．extremely harmful
C．almost futile
D．sensitizing
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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
According to the passage, the railroad played a significant role in literature in all of the following kinds of books EXCEPT ______.
A．thrillers
B．boys' books
C．important novels
D．romances
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