2009年12月大學(xué)英語四級考試模擬試題(四)

　　A) conscientious I) necessity

　　B) conscious J) contribution

　　C) against K) reduced

　　D) despite L) moreover

　　E) comparing M) scaled

　　F) compared N) competitive

　　G) launched O) featuring

　　H) boosted

　　■ Section B

　　Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished sentences. For each of them there are four choices marked A), B), C) and D). You should decide on the best choice.

　　Passage One

　　Questions 21 to 25 are based on the following passage.

　　There are more than 2,000 different kinds of mosquitoes. Female mosquitoes bite people to drink their blood. Male mosquitoes do not drink blood. They drink fluids from plants. The female mosquito uses its thin sucking tube to break the skin, find blood and inject the victim with a substance that keeps blood flowing.

　　The female mosquito drinks the blood and uses it to produce as many as 250 eggs. The insect leaves the eggs in any standing water.

　　The eggs produce worm-like creatures called larvae (幼蟲) in two days to a few months. However, some eggs can stay in water for years until conditions are right for development. The larvae feed on organisms in the water. After four to ten days, they change again, into creatures called pupas (蛹). The pupas rise to the surface of the water. Adult mosquitoes pull themselves out of the pupas and fly away.

　　The World Health Organization (WHO) says mosquitoes carry organisms that cause disease and death for millions of people throughout the world. The most important disease spread by mosquitoes is malaria (瘧疾). The WHO says 247 million people became infected with malaria in 2006. Malaria caused almost one million deaths, mostly among children in Africa. The disease is found in more than one hundred countries in Africa, Asia, the western Pacific Ocean, the Middle East and Central and South America.