单项选择题

The most successful treatment described in the passage was a serum prepared from ______.

A．the blood of patients who have been stung
B．poison extracted from bees
C．crushed bodies of bees
D．a placebo and a crushed-body extract
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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
单项选择题
The author mentions all of the following as being true about the literature of railroads EXCEPT that ______.
A．many of its writers had experience working on railroads.
B．many of the books were set in railroad stations and yards.
C．the books were well known during the railroads' prime years.
D．quite a few of the books are still popular today.
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