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 again by the spinning(旋转) of the earth. At the equator(赤道) day and night are of the same length. They are both twelve hours long. For six months the North Pole is tilted(倾斜) towards the sun. In those months the Northern Hemisphere gets more hours of sunlight than the Southern Hemisphere.

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1.What’s the meaning of “day”?

A One year.

B 24 hours.

C The time between sunrise and sunset.

D Both B and C.

解析：选D。细节理解题。根据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.可知，故选D。

2.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

解析：选D。推理判断题。根据Always one half of the earth is having day and the other half night. 可知，故选D。

3.A place is moved from day into night and from night into day over and over again by ____ of the earth.

A the pushing

B the pulling

C the spinning

D the passing

解析：选C。细节理解题。根据A place is moved from day into night and from night into day over and over again by the spinning of the earth.可知，故选C。

4.When the North Pole is tilted towards the sun, the Northern Hemisphere gets _______ sunlight.

A less

B more

C all

D no

解析：选B。细节理解题。根据For six months the North Pole is tilted towards the sun. In those months the Northern Hemisphere gets more hours of sunlight than the Southern Hemisphere.可知，故选B。