ei nino is name given to the masterious and often unpredictable change in the climate of the world.this strange ___1_____happens every five to eight years.it starts in the paacific 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 ____2___,the ocean comperatures rise causing the peru current flowing in form the east to warm up by as much as 5`c.
the warming of the ocean has far-reaching effects.the hot,humid(潮湿的)air over the ocean causes severe __3___thunderstorms.the rainfall is increased acrossaounth american ____4___floods to peru.in the west pacific,there are droughts affecting australia and indonesia.so while some parts of the world perpare for heavy rains and floods,other parts face drought,poor crops and____5____.
ei nino usually lasts for about 18 months the 1982-83 ei nino brough the most___6____weather in mordern history .its effect was worldwide and it left more than 2,000 people dead and caused over eight billion pounds ____7___of damage.the 1990 ei 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)phenomenonn)worth
g)stable o)strike
h)attraction
答案与解析：
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