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  3. When a disease of epidemic proportions threatens the public, scientists immediately get to work, trying to locate the source of

When a disease of epidemic proportions threatens the public, scientists immediately get to work, trying to locate the source of

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问题     When a disease of epidemic proportions threatens the public, scientists immediately get to work, trying to locate the source of affliction and find ways to combat. Vaccination is one of the effective ways to protect the (1)_____ population of a region or country which may be (2)_____ grave risk. The process of vaccination allows the patient’s body to (3)_____ immunity to the virus or disease so that, if it is encountered, one can fight it (4)_____ naturally. To accomplish this, a small weak or dead (5)_____ of the disease is actually injected into the patient in a controlled environment, (6)_____ his body’s immune system can learn to fight the invader (7)_____. Information (8)_____ how to penetrate the disease’s defenses is (9)_____ to all elements of the patient’s immune system in a process that occurs naturally, in which genetic information is passed from cell to cell. This makes sure that (10)_____ the patient later come into contact with the real problem, his body is well equipped and trained to (11)_____ with it, having already done so before.
    There are, however, dangers (12)_____ in the process. (13)_____, even the weakened version of the disease contained in the vaccine proves (14)_____ much for the body to handle, resulting in the immune system (15)_____, and, therefore, the patient’s death. Such is the case of the smallpox vaccine, (16)_____ to eradicate the smallpox epidemic that nearly (17)_____ the whole Native American population and killed massive numbers of settlers. (18)_____ 1 in 10,000 people who receive the vaccine (19)_____ the smallpox disease from the vaccine itself and dies from it. Consequently, the process, which is truly a (20)_____, may indeed hide some hidden curses.
Notes:
proportions(pl.)规模；程度；大小。affliction(疾病)痛苦。vaccination n.接种疫苗。eradicate v.根除，消灭。

选项 A、would
B、should
C、if only
D、even if
答案B
解析 结构搭配。本句是省略倒装的将来时虚拟条件句，复原后为：If the patient should later come into contact with the real problem. if only 虽然也可以引导虚拟条件句，但句中谓语动词应该用一般过去时表示。可本句的谓语动词是come，故不能用if only。even if(即使)也不能入选，因为从句中主谓不一致。
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考研英语一

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