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.
[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
[H] attraction
[M] exhaustion
47【解析】选[F]。 空格前为一形容词,通常其后修饰名词,可推知空格处要填一单数名词。从前文可知,所填名词指代EI Nino(厄尔尼诺)这种奇怪的气候现象。选项中共有六个名词,而能指代EI Nino的只有[F] phenomenon(现象)。
48【解析】选[B]。从主谓搭配来看,空格处描绘信风在哪方面减弱(the trade winds lessen),选项中剩下的五个名词中能形容风力减弱的只有[B] strength。
49 【解析】选[E]。选项中能修饰名词thunderstorms(雷暴)的形容词,并且和闷热、潮湿的空气气候现象相联系的只有 [E]tropical(热带的),选项中其他两个形容词[J] destructive(毁灭性),与severe意思重复,而 [G] stable(稳定的)不用来修饰thunderstorms。
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