依下文回答第 37 題至第 40 題 The lexicon of oncology is filled with military metaphors: the war on cancer, aggressive tumors, magic bullets.And although these are indeed only metaphors, they do reflect an underlying attitude--that it is the clinician's job toattack and destroy his patient's tumor directly, with whatever weapons that come in handy. 37 There is even talkof biological agents, in the form of viruses specifically tailored to seek out and eliminate their tumorous targets.38 But as Sun Tzu observed, the wisest general is not one who wins one hundred victories in one hundredbattles, but rather one who overcomes the armies of his enemies without having to fight them himself. And one way todo that is to get someone else to do your fighting for you.39 Instead of attacking cancer directly, immunotherapy recruits a patient's immune system to do theattacking. The latest way of doing so is by removing the controls which keep the immune system in check during timesof bodily peace, let it damage the person it is supposed to be protecting. Now, as a series of papers presented in June2013 to the annual meeting of the American Society of Clinical Oncology in Chicago shows, its range is beingextended. 40 The treatment of melanoma that started the ball rolling employed a particular drug calledipilimumab, a monoclonal antibody
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(A) The troops on the front will be no untested conscripts, experienced marines and special forces.
(B) But so far the patient has no clear sense of the cancer, its treatment and recovery.
(C) As in real warfare, those weapons may be conventional, chemical or nuclear.
(D) But some tumors prove unknowable and unconquerable.