四六级考试

【单选题】How does the medical profession regard the bypass operation


A．Many doctors believe it to be the best answer for reducing heart disease.
B．Many doctors think it should be used to prevent clogged arteries.
C．Many doctors think the sooner it is used for a patient with early arterial disease, the more effective it is.
D．Many doctors question the advisability of its use where only one artery is affected.