王迈迈英语

C) the US is the major source of lead pollution in arctic snow

　　D) lead will stay in soil and snow longer than expected

　　27. Lead accumulation worldwide decreased significantly after the use of unleaded gas in the US

　　A) was introduced

　　B) was discouraged

　　C) was prohibited by law

　　D) was enforced by law

　　28. How did scientists discover the source of lead pollution in Greenland?

　　A) By analyzing the data published in journals like Nature and Ambio.

　　B) By studying the chemical elements of soil and snow in Northeastern America.

　　C) By comparing the chemical compositions of leaded gasoline used in various countries.

　　D) By observing the lead accumulations in different parts of the arctic area.

　　29. The authors of the Ambio study have found that

　　A) forests get rid of lead pollution faster than expected

　　B) lead deposits are widely distributed in the forests of the US

　　C) lead accumulations in forests are more difficult to deal with

　　D) the upper layers of soil in forests are easily polluted by lead emissions

　　30. It can be inferred from the last paragraph that scientists

　　A) lack sufficient means to combat lead pollution

　　B) still consider lead pollution a problem

Part III Vocabulary (20 minutes)

　　Directions: There are 30 incomplete sentences in this part. For each sentence there are four choices marked A), B), C) and D). Choose the ONE answer that best completes the sentence. Then mark the corresponding letter on the Answer Sheet with a single line through the centre.

　　31. Salaries for positions seem to be higher than for permanent ones.

　　A) temporary　　B) voluntary　　C) optional　　D) legal

　　32. Mrs. gmithwas so about everything that no servants could please her.

　　A)precise　　B)particular　　C)specific　　D)special

　　33. His temper and personalky show that he can become a soldier of the top

　　A) circle　　B) category　　C) grade　　D) rank

　　34. There has been a collision a number of cars on the main road to town.

　　A) engaging　　B) composing　　C) involving　　D) consisting

　　35. Norman Davis will be remembered by many with not only as a great scholar but also as a most delightful and faithful friend.

　　A) friendliness　　B) affection　　C) kindness　　D) warmth

　　36. Science and technology have in important ways to the improvement of agricultural production.

　　A)witnessed　　B) assisted　　C) attached　　D)contributed

　　37. He never arrives on time and my is that he feels the meetings are useless.

　　A) conference　　B) inference　　C) preference　　D) reference

　　38. Only those who can to lose their money should make high-risk investments.

　　A) afford　　B) endure　　C) sustain　　D) maintain

　　39. Ten days ago the young man informed his b