18.To many web-building spiders,most of whom are nearly blind,the web is their essential window on the world:their means of communicating,capturing prey(獵物),meeting mates and protecting themselves.A web-building spider without its web is like a man cast away on an island of solid rock,totally out of touch and destined to starve to death.
So important is the web to an orb-web spider's survival that the animal will continue to construct new webs daily even if it is being starved.For 16 days the starving spider builds completely normal webs.Then,as the animal gets scrawnier(憔悴的),it constructs a wider-meshed web using fewer strands(線).Such webs would only trap larger prey,which is more economical from the perspective of a starving spider.
The spider stores energy by recycling web protein.It simply eats its own web each evening and reuses it to produce new silk.In studies with radioactively,labeled materials,it was found that 95 percent of web protein reappears in the next day'web.Most of the energy needed for web-building is used in walking over the strands as they are laid down.
Scientists are impressed by the adaptability of the spider's highly preprogrammed brain,which is larger for its size than the brain of any other invertebrate(無脊推動物).If web-building is interrupted,or if some of the existing strands are destroyed,the spider simply goes back to see where the web is left off and then finishes building a normal web.One spider will finish building the incomplete web of another.
8.What is probably the best title for the passage?C
A.Secrets of Spiders'Adaptability
B.Secrets of the Spiders'Life
C.Importance of Webs to Spiders
D.Spiders'Highly Preprogrammed Brain
9.According to the passage,which of the following statements is TRUE?A
A.Web-building spiders will probably die without their webs.
B.One Web-building spider usually conducts one web.
C.Most spiders will stop conducting webs when hungry.
D.Web-building spiders have good eyesight.
10.A spider conducts a wider-meshed web whenB
A.it is 16days old
B.it is getting weaker
C.it has fewer wends
D.it hunts for food
1.A spider's ability to finish an incomplete web proves thatD
A.it reuses its web protein to reproduce new silk
B.it is able to rebuild a destroyed web
C.the incomplete web is much more important
D.it has a highly preprogrammed brain.
分析 本文是一篇科教類閱讀,屬于說明文,本文主要講述了蜘蛛與蜘蛛網(wǎng)的關(guān)系,蜘蛛網(wǎng)對蜘蛛非常重要,一個沒有網(wǎng)的蜘蛛就像一個被扔在荒石島上的人,完全與人失去聯(lián)系,注定要餓死.
解答 8.C.主旨大意題.閱讀全文,根據(jù)文章內(nèi)容可知,本文主要講述了蜘蛛與蜘蛛網(wǎng)的關(guān)系,蜘蛛網(wǎng)對蜘蛛非常重要.故選C.
9.A.細(xì)節(jié)理解題.根據(jù)A web-building spider without its web is like a men cast away on an island of solid rock,totally out of touch and destined to starve to death.可知,一個沒有網(wǎng)的蜘蛛就像一個被扔在荒石島上的人,完全與人失去聯(lián)系,注定要餓死.A.沒有網(wǎng)的話,蜘蛛很可能會死掉.故選A.
10.B.細(xì)節(jié)理解題.根據(jù)Then,as the animal gets scrawnier(憔悴的),it constructs a wider-meshed web using fewer strands(線).可知,蜘蛛用更少的線構(gòu)建網(wǎng),當(dāng)它更虛弱時.故選B.
11.D.細(xì)節(jié)理解題.根據(jù)Scientists are impressed by the adaptability of the spider's highly preprogrammed brain,可知,蜘蛛的高度預(yù)編好的大腦的適應(yīng)性給科學(xué)家們留下了深刻印象.下面用蜘蛛能修補(bǔ)好蜘蛛網(wǎng)為例證明這個論點(diǎn).反之,蜘蛛能修補(bǔ)好蜘蛛網(wǎng)證明了蜘蛛有高度預(yù)編的大腦的論點(diǎn).故選D.
點(diǎn)評 本文是一篇科教類閱讀,題目涉及多道細(xì)節(jié)理解題,推理判斷題,主旨大意題.做題時學(xué)生應(yīng)仔細(xì)閱讀原文,把握文章主要內(nèi)容,聯(lián)系文章上下文內(nèi)容并結(jié)合所給選項(xiàng)含義,從中選出正確答案,一定要做到有理有據(jù),切忌胡亂猜測.