1.确定词性,确定在选项中的选择范围
1)关于动词的判断
l 前后都是名词短语,中间是动词
l 根据一句有且只有一个谓动的原则,其它地方如无谓语动词,则需要谓语动词;反之则不需要谓语动词。
Nowadays, weather experts are able to forecast when an El Nino will 55 , but..
Scientists 54 this to be the longest El Nino for 2,000 years.
l 一个完整的句子之后再跟逗号,后面一般是非谓语动词短语。
The rainfall is increased across South America, 50 floods to Peru.
2)其它词的判断
l 形容词或名词修饰名词,限定词后必有名词
This strange 47 happens every five to eight years.
The hot, humid air over the ocean causes severe 49 thunderstorms.
El Nino usually lasts for about 18 months. The 1981-83 El Nino brought the most 52 weather in modern history.
l 副词修饰形容词或动词
, but they are still not 56 sure what leads to it or what affects how strong it will be.
l 谓语动词前有名词主语
This strange 47 happens every five to eight years.
l 介词后面必有名词
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 C.
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