El Nino usually lasts for about 18 months. The 1981-83 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
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
参考答案:
47. P phenomenon
48. B strength
49. E tropical
50. L bringing
51. K starvation
52. J destructive
53. N worth
54. A estimate
55. O strike
56. I completely
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