A physician who is too thorough in conducting a medical checkup is likely to subject the patient to the discomfort and expense of unnecessary tests. One who is not thorough enough is likely to miss some serious problem and therefore give the patient a false sense of security. It is difficult for physicians to judge exactly how thorough they should be. Therefore, it is generally unwise for patients to have medical checkups when they do not feel ill.
Which one of the following, if true, would most seriously weaken the argument in the passage
A．Some serious diseases in their early stages have symptoms that physicians can readily detect, although patients are not aware of any problem.
B．Under the pressure of reduced reimbursements, pbysicians have been reducing the average amount of time they spend on each medical checkup.
C．Patients not medically trained are unable to judge for themselves what degree of thoroughness is appropriate for physicians in conducting medical checkups.
D．Many people are financially unable to afford regular medical checkups.
E．(E) Some physicians sometimes exercise exactly the right degree of thoroughness in performing a medical checkup.
参考答案：A
解析： 本题论证的重点是病人应该怎样地对待医疗健康检查，因此要削弱本题的论述，就应该从病人入手，而不是应该从医生的方面入手。根据这条原则，很容易发现(B)和(E)都是错误选项；(C)和(D)很显然与论述的内容无关；在(A)表明的条件下，若病人不去接受医疗检查，他们就会错过及早发现严重疾病的机会。因此在这种情况下，无不良感觉时不去接受医疗检查的做法很显然是不明智的，所以(A)是正确答案。