Question

12．The word"day"has two meanings．When we talk about the number of days in a year，we are using"day"to mean 24 hours．But when we talk about day and night，we are using"day"to mean the time between sunrise and sunset．Since the earth looks like a ball，the sun canshine on only half of it at a time．Always one half of the earth is having dayand the other half night．A place is moved from day into night and from nightinto day over and over by the spinning（旋轉(zhuǎn)） of the earth．
At the equator day and night are sometimes the same length．They areeach twelve hours long．The sun rises at 6 o'clock in the morning and sets at 6o'clock in the evening．For six months the North Pole（北極） is tilted（傾斜） toward the sun．In those monthsthe Northern Hemisphere（半球） gets more hours of sunlight than the Southern Hemisphere．Days arelonger than nights．South of the equator nights are longer than days．For theother six months the North Pole is tilted away from the sun．Then the SouthernHemis phere gets more sunlight．Days are longer than nights．North of theequator nights are longer than days．Winter is the season of long nights．Summer is the season of long days．

81．When people talk aboutthe number of days in a year，the"day"here meansC．
A．the timebetween sunrise and sunset          
B.12 hours
C.24 hours                     
D．from morning to evening
82．A place is moved from day into night and fromnight into day over and over byC of the earth．
A．the pushing    
B．the pulling        
C．the spinning        
D．the passing
83．At the equator day is as long as nightA．
A．sometimes          
B．never               
C．usually             
D．a(chǎn)lways
84．When the NorthPole is tilted toward the sun，the Northern Hemisphere getsB sunlight．
A．less           
B．more        
C．a(chǎn)ll           
D．no
85．When it is winter in China，D．
 A．the USA is tilted toward the sun
 B．the South Pole is tilted away from the sun
 C．the North Pole is tilted toward the sun
 D．the North Pole is tilted away from the sun．

Answer 1

分析 這是一篇科普知識短文．"天"這個(gè)詞有兩層意思．當(dāng)我們討論一年中的天數(shù)時(shí)，我們說的"天"就是24小時(shí)；當(dāng)我們討論白天和夜晚時(shí)，我們用"天"表示太陽從升起到落下的這一段時(shí)間．因?yàn)榈厍蚩雌饋硐褚粋�(gè)球，太陽在同一個(gè)時(shí)間只能照到它的一半，所以地球的一般是白天時(shí)，另一半一定是黑夜．在赤道地區(qū)，白天和黑夜有時(shí)是一樣長的．它們都是12小時(shí)．太陽從早上6點(diǎn)升起到下午6點(diǎn)落下．在6個(gè)月時(shí)間內(nèi)，北極點(diǎn)是傾斜對著太陽的，此時(shí)北半球得到的光照時(shí)間要比南半球長，此時(shí)晝長夜短，而赤道以南是夜長晝短．在剩下的6個(gè)月里，北極點(diǎn)遠(yuǎn)離太陽，那么南半球得到的光照就多，它的白天就比夜晚長，赤道以北就夜長晝短．夜晚長的季節(jié)就是冬季，白天長的季節(jié)就是夏季．

解答 81：C．細(xì)節(jié)理解題，根據(jù)第一段When we talk about the number of days in a year，we are using"day"to mean 24 hours．可知指的是24小時(shí)，故選C．
82：C．細(xì)節(jié)理解題，根據(jù)第一段A place is moved from day into night and from night into day over and over by the spinning（旋轉(zhuǎn)）of the earth．"理解可知．晝夜的交替是由地球的自轉(zhuǎn)造成的．選C．
83：A．細(xì)節(jié)理解題，根據(jù)第二段"At the equator（赤道）day and night are sometimes the same length（長度）．They are each twelve hours long．"理解可知．赤道的晝夜長度有時(shí)是一致的．選A．
84：B．細(xì)節(jié)理解題，根據(jù)第二段"For six months the North Pole is tilted（傾斜）toward the sun．In those months the Northern Hemisphere（半球）gets more hours of sunlight than the Southern Hemisphere．"理解可知．當(dāng)北極點(diǎn)對向太陽時(shí)，北極地區(qū)獲得的陽光要多些．選B．
85：D．細(xì)節(jié)理解題，根據(jù)第二段"For the other six months the North Pole is tilted away from the sun．Then the Southern Hemisphere gets more sunlight．"理解可知．當(dāng)中國是冬天時(shí)，南半球傾向太陽光，北極點(diǎn)遠(yuǎn)離太陽，故選D．

點(diǎn)評 作此題是首先通讀全文，理解大意；然后細(xì)讀題目，對選項(xiàng)逐個(gè)核對分析，根據(jù)文章的敘述選出答案．最后再通讀全文，校對答案．