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【单选题】
Nearly 5,000 years ago, during the Late Stone Age, people began building Stonehenge．It became a long-term project．People added to the site for more than 1,500 years．Most likely Stonehenge was first built as a place to hold religious rituals (仪式) and bury the dead．But experts (家) are not sure because there are no written records telling us what took place at Stonehenge.
At first the site was just a circular ditch (沟渠)．Within the circle were two burial hills, and a smaller circle of 56 holes．Scientists have found ashes in the holes．They believed these are from the burning of the dead bodies.
But Stonehenge may have been more than a ritual site．Some experts suggest it was also used as a huge calendar (日历) for watching stars．Outside the entrance of the construction stands the Heel Stone．On the summer solstice, the longest day of the year, a person standing at the center of the circle can look out through the entrance and see the first rays of the rising sun hit the top of the Heel Stone．At the winter solstice, the year's shortest day, a person standing at the entrance can look into the circle and see the setting sun between the stones of a trilithon, formed by two standing stone posts topped by a stone in flat position．In this way Stonehenge may have marked the passing seasons.
The position of the stones and holes shows that Stonehenge may also have been used for watching the moon and stars．The construction may even have been a huge prehistoric' computer' used to study other natural objects in space．The Stone Age people in the area were farmers．Perhaps they used Stonehenge to figure out changes in the weather and to time the planting of their crops.
The purpose of the text is______.
A.
to show research done by today's scientists
B.
to describe life of the Stone Age
C.
to tell about the early farming
D.
to introduce an ancient site
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刷刷题刷刷变学霸
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【多选题】日历异常包括( )。
A.
入选成分股:股票入选成分股,引起股票上涨
B.
分析家推荐:推荐购买某种股票的分析家越多,这种股票越有可能下跌
C.
周末异常:证券价格在星期五趋于上升,在星期一趋于下降
D.
假日异常:在某假日前的最后一个交易日有非正常收益等
【单选题】Strange things happen to time when you travel, because the earth is divided into twenty-four time zones, one hour apart. You can have days with more or fewer than twenty-four hours, and weeks with mor...
A.
Strange things happen to time when you travel, because the earth is divided into twenty-four time zones, one hour apart. You can have days with more or fewer than twenty-four hours, and weeks with more or fewer than seven days.
B.
If you make a five-day trip across the Atlantic Ocean, your ship enters a different time zone every day. As you enter each zone, the time changes one hour. Traveling west, you set your clock back; traveling east, you set it ahead. Each day of your trip has either twenty-five or twenty-three hours.
C.
If you travel by ship across the Pacific, you cross the International Date Line. By agreement, this is the point where a new day begins. When you cross the line, you change your calendar(日历) one full day, backward or forward. Traveling east, today becomes yesterday; traveling west, it is tomorrow.