单项选择题

A primary nurse can propose a different approach of treatment when （）

A．the present one is refused by the patient
B．the patient complains about the present one
C．the present one proves to be ineffective
D．the patient is found unwilling to cooperate

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单项选择题

24（）

A．at this rate
B．above all
C．on an average
D．by way of

单项选择题

According to the context, the word in oncogenes in parA．2 means（）

A. genes that can kill cancer
B. genes that will lead to leukemia
C. viruses that can kill AIDS
D. genes that will lead to cancer