单选题
{{B}}Directions:{{/B}}
Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1.

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 {{U}}(1) {{/U}} population of a region or country which may be {{U}}(2) {{/U}} grave risk. The process of vaccination allows the patient's body to {{U}}(3) {{/U}} immunity to the virus or disease so that, if it is encountered, one can fight it {{U}}(4) {{/U}} naturally. To accomplish this, a small weak or dead {{U}}(5) {{/U}} of the disease is actually injected into the patient in a controlled environment,{{U}} (6) {{/U}}his body's immune system can learn to fight the invader{{U}} (7) {{/U}}. Information {{U}}(8) {{/U}} how to penetrate the disease's defenses is {{U}}(9) {{/U}} 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 {{U}}(10) {{/U}} the patient later come into contact with the real problem, his body is well equipped and trained to {{U}}(11) {{/U}}with it, having already done so before.
There are, however, dangers{{U}} (12) {{/U}}in the process. {{U}}(13) {{/U}}, even the weakened version of the disease contained in the vaccine proves {{U}}(14) {{/U}}much for the body to handle, resulting in the immune system {{U}}(15) {{/U}}, and, therefore, the patient's death. Such is the case of the smallpox vaccine, {{U}}(16) {{/U}}to eradicate the smallpox epidemic that nearly {{U}}(17) {{/U}}the whole Native American population and killed massive numbers of settlers. {{U}}(18) {{/U}} 1 in 10,000 people who receive the vaccine {{U}}(19) {{/U}} the smallpox disease from the vaccine itself and dies from it. Consequently, the process, which is truly a {{U}}(20) {{/U}}, may indeed hide some hidden curses.

{{B}}Notes:{{/B}} 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。

【正确答案】 A

【答案解析】[注释] 词义搭配。entire与whole在许多情况下可以通用。例如：The people's government has the support of the entire(＝whole) population. (人民政府得到全民的支持。)但是，entire可以修饰抽象名词，whole有时就不能。例如：I am in entire ignorance of what he did. (我全然不知他做了些什么。)total与entire不同， total有较强的数量计算意味。例如：The total sum of the expenditure is twelve dollars and fifty-seven cents. (开支总数是12美元57美分。)complete完全的，不缺乏什么的。例如；Now that the missing volume has been found，the series is complete. (丢的那卷找到了，因此这部书又完整了。)complex联合的，复合的。例如：a complex system／network。

【正确答案】 A

【答案解析】[注释] 词义搭配。strain拉力，张力；(动物、昆虫、植物、细菌、病毒等的)系，品系，品种，类型。例如：a new strain of wheat(小麦的新品种)。spell n. (某事物持续的)一段时间。例如：a long spell of warm weather(持续很久的暖和天气)。series系列。例如：a series of debates between two speakers(两位讲演者之间的一系列辩论)。a fit of一阵……，一股……。例如：a fit of anger(一股怒气)。

【正确答案】 B

【答案解析】[注释] 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。

【正确答案】 D

【答案解析】[注释] 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[D]designed。

【正确答案】 B

【答案解析】[注释] 词义型逻辑搭配。approximately大约，是副词，说明后面的数量词。如用 fortunately，naturally或specifically，那么它们都是插入语，表示说话者的态度，一般来说，要用逗号分开。其次，从上述三词本身的词义和句子内容之间的逻辑关系来看，它们均不能构成合理的逻辑搭配，故均被排除。

【正确答案】 D

【答案解析】[注释] 词义搭配。contract在本句中的含义是(=catch or develop [an illness])感染(疾病)，例如：contract SARS／a cold／typhoid(感染非典／感冒／伤寒)。contract作主动语态谓语动词用时，其主语是某人。infect vt.(=cause sb. ／sth. to have a disease)使某人／某物感染。例如：1)Anyone with SARS may infect the people around him．(患非典的人可能会使周围的人感染。)2)The SARS virus infected almost the entire class．(非典病毒感染了几乎全班学生。)从上述二例可以看到， infect意为“(某病源)使某人感染”，而contract意为“(某人)感染得了(某病)”。 affect vt. 影响effect vt.产生，均不能入选。