四级阅读理解技巧讲解附真题分析

Questions 47 to 56 are based on the following passage.

E1 Nino is the 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 (信风), 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 (潮湿的) 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  .
E1 Nino usually lasts for about 18 months. The 1982-83 E1 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 E1 Nino lasted until June 1995. Scientists  54  this to be the longest E1 Nino for 2,000 years.
Nowadays, weather experts are able to forecast when an E1 Nino will  55 , but they are still not  56  sure what leads to it or what affects how strong it will be.
注意：此部分试题请在答题卡2上作答。

A）estimate
B）strength
C）deliberately
D）notify
E）tropical
F）phenomenon
G）stable
H）attraction
I) completely
J) destructive
K) starvation
L) bringing
M) exhaustion
N) worth
O) strike