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.

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    Do you know apples? Have you ever e____apples? What funny questions! You know I'm t____about the apple products(产品) from the USA. Now, there are m____of apple fans in China. Many of t____are teenagers. The price of apple products is very h____but people think they are b____modern and fashionable, as if they are from the future. It is said that there is a student who would like to s____his kidney（肾）to buy an i-phone. In fact, it is not n____for students to own the expensive mobile phones because even you can use the most common one to play games, chat on QQ with friends o____search on the Internet. The biggest use of a mobile phone is making c____and in most schools mobile phones are forbidden(禁止).