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Old 02-21-2003, 06:25 PM   #1 (permalink)
phase
Eager!
 
Join Date: Jan 2003
Location: China
Posts: 82
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Under ethical guidelines recently adopted by the National Institutes of Health, human genes are to be manipulated only to correct diseases for which ________ treatments are unsatisfactory.

A. similar
B. most
C. dangerous
D. uncommon
E. alternative
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