5．High in the sky，a group of birds fly past．The 5-foot-tall creatures are whooping cranes，the tallest birds in North America noted for its loud call．The wild animals appear to be following much larger birds．But those aren't birds at all．They are three-wheeled aircraft called trikes，and the pilots flying them are wearing white helmets and white gowns．That plan might sound like a stupid idea，but it's not．The pilots are from an organization called Operation Migration．They are helping the whooping cranes learn to migrate，or move from one area to another when the seasons change．The cranes are endangered．In 1941，the species had dwindled（減少）to roughly 20 birds because of hunting and habitat loss．US wildlife officials counted 149 whooping cranes in November 1995，the most since the American government began taking censuses（統(tǒng)計(jì)）in the 1930s．Today，about 380 remain．
In the fall，whooping cranes are supposed to migrate south．However，many of them don't know how．"With so few birds left，young whooping cranes typically don't have parents around to teach them，"explains pilot Joe Duff．
That's where the trikes come in．Each October，pilots dress up as whooping cranes and take to the skies in Wisconsin．The young birds follow them because they think the trikes are big whooping cranes．
It takes about three months to reach south-with plenty of rest stops on the way．The pilots lead the cranes to refuges，or protected areas，in Florida．
This spring，the birds will migrate north by themselves-no trikes needed!"It's nice because you know the birds are going to make it，"Duff told WR News．
41．We can learn from the passage that whooping cranesC．
A．a(chǎn)re the tallest birds in the world         
B．a(chǎn)ren't birds at all
C．a(chǎn)re increasing in the past 15 years       
D．have no team spirit
42．The three-wheeled aircraft serve asA．
A．a(chǎn)dult cranes
B．food suppliers 
C．temporary habitats 
D．hunting tools
43．It can be inferred from the passage thatA．
A．the aircraft make a great difference to the cranes
B．the aircraft don't have an effect on the cranes
C．the cranes get lost frequently
D．the cranes fly to Florida nonstop
44．According to the passage，which of the following is TRUE？D．
A．Whooping cranes are famous for their height．
B．The pilots wear helmets and gowns to attract people's attention．
C．Whooping cranes want to migrate north in the autumn．
D．Whooping cranes will migrate on their own this spring．
45．What's the main idea of the passage？B
A．Baby whooping cranes don't have parents around．
B．Pilots show baby whooping cranes how to migrate．
C．Whooping cranes are becoming endangered．
D．Whooping cranes are a clever species．

分析 本文屬于說(shuō)明文閱讀，作者通過(guò)這篇文章主要向我們描述了飛行員顯示嬰兒高鳴鶴如何遷移，幫助鳴鶴增加生存率，成功學(xué)會(huì)遷徙．

解答 41．C．推理判斷題．根據(jù)第一段US wildlife officials counted 149 whooping cranes in November 1995，the most since the American government began taking censuses（統(tǒng)計(jì)）in the 1930s．Today，about 380 remain可知鳴鶴的數(shù)量正在增加；故選C．
42．A．細(xì)節(jié)理解題．根據(jù)第三段That's where the trikes come in．Each October，pilots dress up as whooping cranes and take to the skies in Wisconsin可知三輪飛機(jī)充當(dāng)成年鶴；故選A．
43．A．推理判斷題．根據(jù)第四段pilots dress up as whooping cranes and take to the skies in Wisconsin．The young birds follow them because they think the trikes are big whooping cranes可知這架飛機(jī)與一般的飛機(jī)有很大差別；故選A．
44．D．細(xì)節(jié)理解題．根據(jù)最后一段This spring，the birds will migrate north by themselves-no trikes needed可知今年春天美洲鶴會(huì)自己遷徙；故選D．
45．B．主旨大意題．文章主要講了飛行員顯示嬰兒高鳴鶴如何遷移，幫助鳴鶴增加生存率，成功學(xué)會(huì)遷徙；故選B．

點(diǎn)評(píng) 考察學(xué)生的細(xì)節(jié)理解和推理判斷能力，做細(xì)節(jié)理解題時(shí)一定要找到文章中的原句，和題干進(jìn)行比較，再做出正確的選擇．在做推理判斷題不要以個(gè)人的主觀想象代替文章的事實(shí)，要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷．

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