2014考研英语复习：模拟试题之完型专项练习(五十三)
SectionⅠ Use of English
Directions:
Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1. ( 10 points )
Among the devastating consequences of AIDS has 1 its epidemic spread in the developing world. The disease has caused 2 suffering, debilitation, loss of life and disruption of family, social and economic 3. Because of the considerable expense and logistical difficulty in providing antiviral drugs to populations 4 with the human immunodeficiency virus 5 the world, the biomedical community is looking towards vaccines to help solve this compelling problem.
The search for an AIDS vaccine began more than 15 years ago with great 6 and high expectations. With the 7 of the human immunodeficiency virus (HIV) as the cause of AIDS, it seemed that a 8 would follow closely behind. But despite a large concerted effort, the problem has proven more difficult than 9, and progress has not 10 the 11 hopes. Here I review the 12scientific obstacles confronting the development of an effective HIV vaccine, and I consider 13 strategies to overcome these obstacles.
It is instructive to consider the circumstances that have 14 to past successes in vaccine development. The smallpox vaccine is 15 the most successful inventions in the history of 16. Why, 200 years ago, without the benefit of modern biotechnology, did the smallpox vaccine succeed so readily while an AIDS vaccine 17 elusive? The answer lies in an experiment of nature that provided, to an astute observer, a clear direction for smallpox vaccine development. In this classic story of 18 discovery, Edward Jennet noticed that milk maids who had previously contracted cowpox were 19 to smallpox infection. This observation was the critical event leading to the finding that the cowpox virus cross-reacted immunologically with the smallpox virus and could 20 be used to protect against smallpox.
1. A. on B. with C. been D. about
2. A. unpredicted B. uncontrollable C. unimaginable D. unprecedented
3. A. stability B. instability C. permanency D. soundness
4. A. harmed B. infected C. infectious D. infectable
5. A. everywhere B. throughout C. devastating D. occupying
6. A. difficulty B. concern C. optimism D. pessimism
7. A. /confirm/iation B. identification C. information D. precaution
8. A. cure B. capsule C. medication D. vaccine
9. A. ever B. anticipated C. possible D. necessary
10. A. surpassed B. out-balanced C. matched D. rivaled
11. A. origin B. initial C. great D. modest
12. A. majority B. primary C. principal D. premier
13. A. potential B. initiative C. practical D. existing
14. A. lead B. caused C. contributed D. cooperated
15. A. by far B. till now C. among D. considered
16. A. vaccine B. medicine C. smallpox D. AIDS
17. A. slowly B. fails C. remains D. counts
18. A. accidental B. importanc C. scientific D. vaccine
19. A. vulnerable B. resistant C. opposing D. defendant
20. A. safely B. therefore C. as well D. possibly
