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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、invented
B、discovered
C、investigated
D、designed
答案D
解析 词义搭配。be designed to do sth.是一个习语，意为(＝be made or planned for a particular purpose or use)为某目的和用途而研制或谋划。例如：The route is designed to relieve traffic congestion. (这条路是为缓解交通拥挤而开辟的)。invent vt.发明discover vt.发现；investigate vt.调查研究，均不合题意，因为天花疫苗不是"发明的"、"发现的"、"调查研究的"，而是为一特定目的或用途"研制出来的"，故应选designed。
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考研英语一

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