单项选择题


A．effect
B．affect
C．affirm
D．offer
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单项选择题
A．bowlsB．jobsC．machinesD．themselves
A．bowls
B．jobs
C．machines
D．themselves
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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