分析 短文主要講了科學(xué)研究發(fā)現(xiàn),通過(guò)研究頭發(fā)可知你來(lái)自何方.
解答 28.B.細(xì)節(jié)理解題.根據(jù)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?dú)渫凰孛恳环N類的重量不同,因此選 B 項(xiàng).
29.D.細(xì)節(jié)理解題.根據(jù)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(dāng)?shù)刈詠?lái)水的同位素一樣,由此來(lái)推斷這個(gè)人是否來(lái)自當(dāng)?shù)兀?br />30.C.推理判斷題.根據(jù)最后一段中的narrow their search for clues可知,該段說(shuō)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(xué)研究發(fā)現(xiàn),通過(guò)研究頭發(fā)可知你來(lái)自何方,因此是對(duì)頭發(fā)的偵查,故答案為C.
點(diǎn)評(píng) 解答任務(wù)型閱讀理解題,首先對(duì)原文材料迅速瀏覽,掌握全文的主旨大意.因?yàn)殚喿x理解題一般沒(méi)有標(biāo)題,所以,速讀全文,抓住中心主旨很有必要,在速讀的過(guò)程中,應(yīng)盡可能多地捕獲信息材料.其次,細(xì)讀題材,各個(gè)擊破.掌握全文的大意之后,細(xì)細(xì)閱讀每篇材料后的問(wèn)題,弄清每題要求后,帶著問(wèn)題,再回到原文中去尋找、捕獲有關(guān)信息.最后,要善于抓住每段的主題句,閱讀時(shí),要有較強(qiáng)的針對(duì)性.對(duì)于捕獲到的信息,要做認(rèn)真分析,仔細(xì)推敲,理解透徹,只有這樣,針對(duì)題目要求,才能做到穩(wěn)、準(zhǔn).
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