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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单项选择题
The word fatal in paragraph 1, sentence 1 is closest in meaning to ______.
A．harmful
B．lethal
C．painful
D．disease-causing
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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