分析 本文主要講述了科學(xué)研究對于北極熊在冰封期、禁食季時的食物補給問題的調(diào)查.結(jié)果顯示,他們極容易在那是體重減輕.
解答 63.B 細節(jié)題.根據(jù)文章內(nèi)容Although some scientists previously believed land-based foods could supplement(補充)the bears'nutritional needs until the sea ice returns,a new study has revealed that access to terrestrial food is not sufficient to reduce the rate of body mass loss for fasting polar bears.盡管科學(xué)家之前相信,陸地食物補給可以滿足北極熊的營養(yǎng)需求,但是最新的研究表明,在冰封時期沒有海洋食物的支撐,北極熊靠陸地食物,體重有了大幅下降,結(jié)合選項,故選B
64.C 推理題.根據(jù)文章內(nèi)容On average,polar bears lost 2.2 pounds(1 kilogram)of mass per day--exactly the same amount as free-ranging(自由放養(yǎng)的)bears measured during the ice-free season on the coastline of Hudson Bay.Scientists reported that even with land-based food opportunities,polar bears lost the same amount of weight.在研究過程中,熊被人為的飼養(yǎng)起來,而體重會每天的減少.減少的體重和冰封時期自由放養(yǎng)時減少的體重相似,結(jié)合選項,故選C
65.D 詞義猜測題.根據(jù)文章內(nèi)容Some studies have suggested that polar bears could adapt to land-based foods to offset the missing calories during a shortened hunting period on the ice,"一些研究表明,北極熊能夠適應(yīng)陸地食物來對減輕的體重進行彌補,結(jié)合選項,故D符合文意.
66.A 細節(jié)題.根據(jù)文章內(nèi)容."Subadult polar bears have lower fat stores,and the added energy demands associated with growth,"未成年的熊更容易餓是因為他們?yōu)殚L大,身體的脂肪存儲量小,其次他們需要更多的能量來使得自己成長,結(jié)合選項,故選A
點評 本文是科教類閱讀理解.做這類題材閱讀理解時要求考生對文章通讀一遍,做題時結(jié)合原文和題目有針對性的找出相關(guān)語句進行仔細分析,結(jié)合選項選出正確答案.推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案,切忌胡亂猜測,一定要做到有理有據(jù)
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