1.A.a(chǎn)ccurate B.a(chǎn)lteration C.a(chǎn)verage D.calculates E.conceal F.enormously G.initial H.intervals I.merely J.multiply K.prediction

Beyond two or three days,the world's best weather forecasts are based on guesswork,and beyond six or seven they are worthless.
The Butterfly Effect is the reason.For small pieces of weather-and to a global forecaster,small can mean thunderstorms and snowstorms-any (41)K fails rapidly.Errors and uncertainties (42)J,gathering upward through a chain of unstable features,from dust devils (塵旋風(fēng)) and windstorms up to continent-size eddies (旋風(fēng)) (43)I satellites can see.
The modern weather models work with a network of points of the order of sixty miles apart,and even so,some (44)Gdata has to be guessed,since ground stations and satellites cannot see everywhere.But suppose the earth could be covered with sensors spaced one foot apart,rising at one-foot (45)H all the way to the top of the atmosphere.Suppose every sensor gives perfectly (46)A readings of temperature,pressure,dampness,and any other quantity a meteorologist (氣象工作者) would want.Exactly at noon a(n) (47)F powerful computer takes all the data and (48)D what will happen at each point at 12.01,then 12.02,then 12.03 …
The computer will still be unable to predict whether Princeton,New Jersey,will have sun or rain on a day one month away.At noon the spaces between the sensors will (49)E alterations that the computer will not know about,tiny variations from the (50)C.By 12.01,those alterations will already have created small errors one foot away.Soon the errors will have multiplied to the ten-foot scale,and so on up to the size of the globe.

分析 世界上最好的天氣預(yù)報(bào)能預(yù)測(cè)2-3天的天氣情況,超過(guò)6-7天就沒(méi)有什么意義了.

解答 41-45  KJIGH       46-50  AFDEC
41.K 考查名詞.根據(jù)第一段的內(nèi)容"the world's best weather forecasts"可知,話題是有關(guān)天氣預(yù)報(bào),所以"prediction"意思是"預(yù)測(cè)".
42.J考查動(dòng)詞.通過(guò)句子里的"through a chain of unstable features"可知"錯(cuò)誤和不確定性"是成倍增長(zhǎng)的.
43.I考查副詞.對(duì)于"continent-size eddies"幅度比較大的旋風(fēng),普通預(yù)測(cè)不出來(lái),只有衛(wèi)星能預(yù)測(cè).
44.G考查形容詞.根據(jù)since ground stations and satellites cannot see everywhere推出因?yàn)榈孛鏆庀笳静荒苊總(gè)地方否預(yù)測(cè)到,所以原始數(shù)據(jù)都靠猜測(cè).
45.H考查名詞. all the way to the top of the atmosphere提示我們每隔一步間隔的距離就放置一個(gè)感應(yīng)器.
46.A考查形容詞.根據(jù) 后面的"readings of temperature,pressure,dampness"這一系列都是準(zhǔn)確的數(shù)據(jù).
47.F考查副詞.此處需要用一個(gè)副詞來(lái)修飾形容詞,enormously powerful 意思是力量非常強(qiáng)大的.
48.D考查動(dòng)詞.calculate意思是計(jì)算,和句子里take并列謂語(yǔ)動(dòng)詞.
49.E考查動(dòng)詞.根據(jù)前句The computer will still be unable to predict 電腦不能預(yù)測(cè)一個(gè)月以外天氣情況,所以會(huì)隱藏一些天氣.
50.C考查形容詞.from the average意思是從平均上來(lái)說(shuō),電腦有時(shí)候連細(xì)微的變化都會(huì)忽略.

點(diǎn)評(píng) 本題的題型屬于十一選十,它的做題原則是:所給單詞的詞性及詞義與空格所需的詞性和詞義匹配.選用時(shí)要注意,認(rèn)真觀察前后文,結(jié)合語(yǔ)境語(yǔ)義分析題目.

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