单项选择题

It is the lack of money that has held up the progress in using replacement genes to cure cancer.

A． Right
B． Wrong
C． Not mentioned
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单项选择题
FDA has approved the plan of using HIV to cure cancer in humans.
A． Right
B． Wrong
C． Not mentioned
单项选择题
HIV can be safely used to cure cancer only if the deadly genes have been removed.
A． Right
B． Wrong
C． Not mentioned
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