分析 短文主要講了科學研究發(fā)現,通過研究頭發(fā)可知你來自何方.
解答 28.B.細節(jié)理解題.根據第三段中的Hydrogen and oxygen atoms can vary in how much they weigh.In the case of hydrogen,for example,there are three types according to their weights 可知氫同位素每一種類的重量不同,因此選 B 項.
29.D.細節(jié)理解題.根據第四段中的the researchers have found that people's hair has the same isotopes as found in the local tap water可知,頭發(fā)中的同位素與當地自來水的同位素一樣,由此來推斷這個人是否來自當地.
30.C.推理判斷題.根據最后一段中的narrow their search for clues可知,該段說明了分析頭發(fā)的用處,故答案為C.
31.C.主旨大意題,短文主要講了科學研究發(fā)現,通過研究頭發(fā)可知你來自何方,因此是對頭發(fā)的偵查,故答案為C.
點評 解答任務型閱讀理解題,首先對原文材料迅速瀏覽,掌握全文的主旨大意.因為閱讀理解題一般沒有標題,所以,速讀全文,抓住中心主旨很有必要,在速讀的過程中,應盡可能多地捕獲信息材料.其次,細讀題材,各個擊破.掌握全文的大意之后,細細閱讀每篇材料后的問題,弄清每題要求后,帶著問題,再回到原文中去尋找、捕獲有關信息.最后,要善于抓住每段的主題句,閱讀時,要有較強的針對性.對于捕獲到的信息,要做認真分析,仔細推敲,理解透徹,只有這樣,針對題目要求,才能做到穩(wěn)、準.
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