The word “day” has two meanings. When we talk about the number of days in a year, we

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 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(北极) 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 people talk about the number of days in a year, the “day” here means        .

A. the time between sunrise and sunset          B. 12 hours

  C. 24 hours                                                 D. from morning to evening

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

1C  2C  3A  4B  5D