EI 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(信風(fēng)), 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 warning of the ocean has far-reaching effects. The hot, humid (潮濕的)air over the ocean causes severe49 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. 滬江四六級 http://cet.hjenglish.com

?????? EI Nino usually lasts for about 18 months. The 1982-83 EI 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 EI Nino lasted until June 1995. Scientists 54 this to be the longest EI Nino for 2,000 years.

?????? Nowadays, weather experts are able to forecast when an EI Nino will 55, but they are still not 56 sure what leads to it or what affects how strong it will be. 滬江四六級 http://cet.hjenglish.com

?

[F] phenomenon??
[B] strength???
[E] tropical???
[L] bringing??
[K] starvation???
[J] destructive?
[N]? worth?
[A] estimate
[O] strike??
[I] completely
[C] deliberately
[D] notify

[G] stable? 滬江四六級 http://cet.hjenglish.com

[H] attraction

[M] exhaustion? 滬江四六

級 http://cet.hjenglish.com

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47【解析】選[F]。 空格前為一形容詞，通常其后修飾名詞，可推知空格處要填一單數(shù)名詞。從前文可知，所填名詞指代EI Nino（厄爾尼諾）這種奇怪的氣候現(xiàn)象。選項中共有六個名詞，而能指代EI Nino的只有[F] phenomenon（現(xiàn)象）。

48【解析】選[B]。從主謂搭配來看，空格處描繪信風(fēng)在哪方面減弱（the trade winds lessen），選項中剩下的五個名詞中能形容風(fēng)力減弱的只有[B] strength(力量)。

49【解析】選[E]。選項中能修飾名詞thunderstorms（雷暴）的形容詞，并且和悶熱、潮濕的空氣氣候現(xiàn)象相聯(lián)系的只有[E]tropical（熱帶的），選項中其他兩個形容詞[J] destructive（毀滅性），與severe(嚴(yán)重的)意思重復(fù)，而 [G] stable（穩(wěn)定的）不用來修飾thunderstorms。
滬江四六級 http://cet.hjenglish.com

50【解析】選[L]。此處逗號起重要提示作用，逗號后面部分為伴隨狀態(tài)，起補(bǔ)充說明作用。選項中只有動詞的現(xiàn)在分詞形式符合題意，[L] bringing為正確選項。

51【解析】選[K]。從關(guān)鍵連詞while，可知此處while前后兩分句形成結(jié)構(gòu)上和語義上的對比，從選項中剩下的四個名詞中選出能和drought（干旱）、poor crops（農(nóng)作物歉收）構(gòu)成語義上的順承關(guān)系的名詞是[K] starvation(饑荒)。強(qiáng)干擾項 [M] exhaustion（耗盡枯竭）不能很好地描述poor crops現(xiàn)象。

52【解析】選[J]。此處填一形容詞修飾weather。選項中只剩下兩個候選形容詞。從后一句話對其帶來影響的描述(2,000 people dead) 可輕松地選對[J] destructive(毀滅性的)。

53【解析】選[N]。此處填一名詞，能與eight billion pounds形成合理搭配，且修飾damage（損失），選項中只有[N] worth（價值）符合題意。 滬江四六級 h
ttp://cet.hjenglish.com

54【解析】選[A]。此處填一動詞。選項中有三個動詞為候選項。從賓語來看，the longest EI Nino for 2,000 years(兩千年以來持續(xù)時間最長的厄爾尼諾現(xiàn)象)為結(jié)論性的話，排除[O] strike（打擊）；[D] notify（通知）為不及物動詞，后接介詞of，不選；[A] estimate（評估）符合題意。

55【解析】選[O]。此處填一動詞，主語為EI Nino，在兩個候選的動詞中，[D] notify（通知）主語通常為人，排除它。[O] strike作及物動詞時表示“到達(dá), 侵襲”，與題意相符。 滬江四六級 http://cet.hjenglish.com

56【解析】選[I]。從空格后的形容詞sure（確定的）可知此處填一副詞。選項中兩個副詞completely(完全地)和deliberately（故意地），很容易能選I) completely（完全地）為正確選項。