英语四级考试阅读选词填空练习2

　　Directions: In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in bank is identified by a letter. Please mark the corresponding letter for each item on Answer Sheet 2 with a single line through the centre. You may not use any of the words in the bank more than once.

　　Questions 47 to 56 are based on the following passage.

　　EI Nino is name given to the mysterious and often unpredictable change in the climate of the world. This strange __47__ happens every five to eight years. It starts in the Pacific Ocean and is thought to be caused by a failure in the trade winds ，which affects the ocean currents driven by these winds. As the trade winds lessen in __48__, the ocean temperatures rise, causing the Peru current flowing in from the east to warm up by as much as 5℃.

　　The warming of the ocean has far-reaching effects. The hot, humid air over the ocean causes severe __49__ thunderstorms. The rainfall is increased across South America. __50__ floods to Peru. In the West pacific, there are droughts affecting Australia and Indonesia. So while some parts of the world prepare for heavy rains and floods, other parts face drought, poor crops and __51__.

　　El Nino usually lasts for about 18 months. The 1982-83 El Nino brought the most __52__ weather in modern history. Its effect was worldwide and it left more than 2,000 people dead and caused over eight billion pounds __53__ of damage. The 1990 El Nino lasted until June 1995. Scientists __54__ this to be the longest El Nino for 2,000 years.

　　Nowadays, weather experts are able to forecast when an El Nino will __55__, but they are still not __56__ sure what leads to it or what affects how strong it will be.

　　A) estimate I) completely

　　B) strength J) destructive

　　C) deliberately K) starvation

　　D) notify L) bringing

　　E) tropical M) exhaustion

　　F) phenomenon N) worth

　　G) stable O) strike

　　H) attraction

　　Unit 2

　　47. F 48. B 49.E 50. L 51.K

　　52. J 53 .N 54. A 55.O 56.I