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（旋转） 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（北极） is tilted（倾斜） 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．always
84．When the NorthPole is tilted toward the sun，the Northern Hemisphere getsB sunlight．
A．less           
B．more        
C．all           
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 这是一篇科普知识短文．"天"这个词有两层意思．当我们讨论一年中的天数时，我们说的"天"就是24小时；当我们讨论白天和夜晚时，我们用"天"表示太阳从升起到落下的这一段时间．因为地球看起来像一个球，太阳在同一个时间只能照到它的一半，所以地球的一般是白天时，另一半一定是黑夜．在赤道地区，白天和黑夜有时是一样长的．它们都是12小时．太阳从早上6点升起到下午6点落下．在6个月时间内，北极点是倾斜对着太阳的，此时北半球得到的光照时间要比南半球长，此时昼长夜短，而赤道以南是夜长昼短．在剩下的6个月里，北极点远离太阳，那么南半球得到的光照就多，它的白天就比夜晚长，赤道以北就夜长昼短．夜晚长的季节就是冬季，白天长的季节就是夏季．

解答 81：C．细节理解题，根据第一段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小时，故选C．
82：C．细节理解题，根据第一段A place is moved from day into night and from night into day over and over by the spinning（旋转）of the earth．"理解可知．昼夜的交替是由地球的自转造成的．选C．
83：A．细节理解题，根据第二段"At the equator（赤道）day and night are sometimes the same length（长度）．They are each twelve hours long．"理解可知．赤道的昼夜长度有时是一致的．选A．
84：B．细节理解题，根据第二段"For six months the North Pole is tilted（倾斜）toward the sun．In those months the Northern Hemisphere（半球）gets more hours of sunlight than the Southern Hemisphere．"理解可知．当北极点对向太阳时，北极地区获得的阳光要多些．选B．
85：D．细节理解题，根据第二段"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．当中国是冬天时，南半球倾向太阳光，北极点远离太阳，故选D．

点评 作此题是首先通读全文，理解大意；然后细读题目，对选项逐个核对分析，根据文章的叙述选出答案．最后再通读全文，校对答案．