单项选择题

A) increase C) promote
B) enhance D) enlighten

A．increase
B．enhance
C．promote
D．enlighten
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单项选择题
A) advocacies C) endorses B) opposes D) sustains
A．advocacies
B．opposes
C．endorses
D．sustains
单项选择题
How does the author indicate oncogenes
A．They are always in operation in a healthy person.
B．They remain unharmful so long as they are not activated.
C．They can be driven out of normal cells.
D．Normal cells can't turn them off.
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