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（长度）. 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）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.A place is
moved from day into night and from night into day over and over by ________ of
the earth.
A. the pushing B. the pulling C. the spinning D. the passing
3.．At the
equator day is as long as night ________.
A. sometimes B. never C. usually D. always
4.When the North
Pole is tilted toward the sun, the Northern Hemisphere gets ________
sunlight.
A. less B. more C. all D. no
5.．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
