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.
What might be the most suitable title for the text?
本题考查词义理解。“keep a lid on”出现在最后一段倒数第二句，下文提到具体做法。根据经济常识，应选B项，表示“限制日元的升值”。
固定题干
根据《中华人民共和国中国人民银行法》的规定，我国货币政策的最终目标是（ ），并以此促进经济增长。
箱子里面有红、白两种玻璃球，红球数比白球数的3倍多两个，每次从箱子里取出7个白球、15个红球。如果经过若干次以后，箱子里只剩下3个白球、53个红球，那么，箱子里原有红球比白球多多少个?
将自然数1~100分别写在完全相同的100张卡片上，然后打乱卡片，先后随机取出4张，问这4张先后取出的卡片上的数字呈增序的几率是多少？（）
对于债券利率的风险结构，描述正确的有（ ）。
市场经济体制下，财政具有的职能有( )。
（ ）决定着生产关系。
左边给定的是纸盒的外表面，下列哪一项能由它折叠而成？（ ）
货币制度最基本的内容是规定（ ）。
如果一国货币汇率上升，即对外升值，就可能会导致（ ）。
（）
