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　　1、單選題

　　[完成句子]The average lightning strike is more than 3 miles long and can travel at a tenth of the speed of light. Ball lightning， the rarest and most mysterious form， derives its name from the small luminous ball that appears near the impact point， moves horizontally， and lasts for several seconds.

　　One form of lightning that __________ is ball lightning.

　　A、occurs most infrequently

　　B、is shifted sideways by strong winds

　　C、is often hidden from our view

　　D、is estimated at 20 millions a year

　　正確答案：A

　　答案解析：本段文字與題目相關(guān)的句子是：Ball lightning, the rarest and most mysterious form, derives its name from the small luminous ball…，關(guān)鍵詞是rarest(rare的最高級(jí)形式)與infrequently“很少發(fā)生，少有”表達(dá)相同的意思。

　　2、

　　單選題

　　[完成句子]The importance of particular metals in the human diet has been realized within the past few decades， and the idea that geology might be related to health has been recognized for a number of elements such as iodine， zinc and selenium. For example， soils with low iodine contents produce crops， and animals deficient in iodine. A lack of iodine in the human diet leads to some serious diseases.

　　Some serious diseases is connected with deficiency of __________.

　　A、industrially polluted soils

　　B、the element of iodine

　　C、rock and soil chemistry

　　D、the persistence of heavy metals

　　正確答案：B

　　答案解析：通過(guò)關(guān)鍵詞Some serious diseases，可將題目定位于最后一句話：A lack of iodine in the human diet leads to some serious diseases. deficiency of和lack of表達(dá)同樣的意思“缺乏、缺少”，因此根據(jù)這句話可以判斷答案為B。

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