The Earth’s axis（轴）is an imaginary line that runs through the middle of the Earth from the North Pole to the South Pole. The axis of the earth is tilted（倾斜）about 23. 5 degrees. This tilt of the earth results in our seasons.
In June，the Northern Hemisphere（半球）is tilted toward the sun，so the people in the Northern Hemisphere have longer and warmer days. The days are shorter and colder in the Southern Hemisphere in June，because the Earth is tilted away from the sun. The days start getting shorter in the Northern Hemisphere and longer in the Southern Hemisphere after about June 21. This is the first day of summer in the Northern Hemisphere and the first day of winter in the southern hemisphere. Daytime lasts exactly as long as nighttime on the first day of autumn（about September 21）and the first day of spring（about March 21）. The first day of winter in the Northern Hemisphere，usually December 21，is the shortest day of the year in the Northern Hemisphere and the longest day of the year in the Southern Hemisphere
The days are longer in summer and shorter in winter the further you move from the equator. It’s generally dark on a summer night in Florida by 8：30 p. m. ，but in Vermont，there will still be some light at l0：00 p. m. . The situation is reversed（相反的）in winter，where the sun will go down in Vermont by 3：45 p. m. ，while there remains light in Florida until 5：15 p. m. . Northern Alaska is called the “Land of the Midnight Sun”，because it never gets dark during the summer months. That part of the Earth is facing the sun all day and all night. Antarctica never sees daylight during those months. The situation is reversed in December and January when northern Alaska never sees the sun while it continues to light the sky at night in Antarctica.
According to the second paragraph，we can know that_____.
- A.the Southern Hemisphere is tilted away from the sun in June
- B.June 21 is the longest day of a year in the Southern Hemisphere
- C.December 21 is the coldest day of a year in the Northern Hemisphere
- D.there is only one day in a year when daytime lasts exactly as long as nighttime
正确答案及解析
正确答案
解析
从第二段“The days are shorter and colder in the Southern Hemisphere in June，because the Earth is tilted away from the sun. ”可知A项正确。BCD三项均与第二段中的内容不符。
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