Question

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 can shine on only half of it at a time．Always one half of the earth is having day and the other half night．A place is moved from day into night and from night into day over and over by the spinning(旋转)of the earth．At the equator(赤道)day and night are sometimes the same length，they are each twelve hours long．The sun rises at 6 o’clock in the morning and sets at 6 o’clock in the evening．For six months the North Pole is tilted(倾斜的)toward the sun．In those months the Northern Hemisphere(半球)gets more hours of sunlight than the Southern Hemisphere．Days are longer than nights．South of the equator nights are longer than days．For the other six months the North Pole is tilted away from the sun．Then the Southern Hemisphere gets more sunlight．Days are longer than nights．North of the equator nights are longer than days．Winter is the season of long nights．Summer is the season of long days．

1.When the Western Hemisphere is having day．the Eastern Hemisphere is having_________．

A. both day and night    B. day

C. neither day nor night    D. night

2.At the equator day is_________ as long as night．

A. sometimes    B. never    C. usually    D. always

3.When the North Pole is tilted toward the sun，the Northern Hemisphere gets _________ sunlight．

A. less    B. more    C. all    D. no

4.When it is winter in China，_________．

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.D

2.A

3.B

4.D

【解析】

这篇短文从day这个单词的两个意思说起，给我们解释了地球上为什么有黑夜和白天，其实这是与地球的自转有关的。

1.推理判断题。根据短文中Always one half of the earth is having day and the other half night可知，当地球的一半是白天的时候，另一半就是黑夜。由此可知，当西半球是白天的时候，那么东半球就是黑夜，故应选D。

2.细节理解题。根据短文中At the equator(赤道)day and night are sometimes the same length, they are each twelve hours long可知，有时候在赤道黑夜和白天一样长，由此可知应选A。

3.细节理解题。根据短文中For six months the North Pole is tilted(倾斜的)toward the sun. In those months the Northern Hemisphere(半球)gets more hours of sunlight than the Southern Hemisphere. Days are longer than nights可知，当北极点倾向于太阳的时候，北半球比南半球得到的阳光更多，白天比黑夜更长。由此可知应选B。

4.推理判断题。根据常识可知，中国在北半球，当中国是冬季的时候，夜晚比白天更长，此时北极应偏离太阳，南极倾向于太阳，故B和C不对；A选项中的美国也在北半球，所以不是倾向于太阳，故A也不对。故选D。