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閱讀理解：
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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