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听力原文： Scientists say they can tell what air and sea conditions were like hundreds of thousands of years ago. They say pieces of ice taken from Greenland provide such information. Scientists took the ice from more than one and a half miles deep in huge masses of ice that float on the sea. That is the deepest scientists have ever drilled for ice. The ice represent 25, 000 years of history. It provides one of the clearest records of ancient weather. European and American scientific teams have been studying ice from the same area to confirm each other's findings. The scientists examined the ice that was formed each year. They measured the oxygen and carbon dioxide in the ice. These measurements tell about the year's temperature. From these measurements the scientific teams say the past ten thousand years is the only period during which the weather has not changed very much. Before that time, they believed very large and sudden changes in the weather were common. The ice appears to show that at some periods Earth's weather changed from very hot to very cold in only ten years.
According to the news, the ice from Greenland provides information about
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A．To make the class more active.B．To leave personal feelings behind.C．To give the wond
Now the city plans to extend public access to the area adjoining Moon Walk in an ambitious design that will, the city hopes, be a part of its development for the next world's fair. This more ambitious concept for the waterfront will be likely to stir considerable debate as competing projects vie (竞争) for the opportunities for profit. The development will therefore require substantial participation, cooperation and scrutiny (详细审查) by citizens to make sure that while private profitability is maintained, the public's needs are satisfied, too.
The joint efforts of environmentalists, business-people, civic leaders and politicians have transformed abandoned, derelict (废弃的) port landscapes in cities throughout America into exciting commercial and recreational centers. Examples are the Cannery in San Francisco, the Riverfront Walk in San Antonio, Faneuil Hall Market in Boston and Harborplace in Baltimore.
It's easy to understand why the port areas were neglected. While many cities were growing up along rivers, lakes and natural harbors, depending on water-borne commerce, waterfronts thrived. After World War Ⅱ, however, technological changes in transportation— improved planes and airports, the interstate highway system, larger tracks for freight trains and containerized shipping--rendered many old port facilities obsolete. Waterfront areas became peripheral (外围的) to the life of the city. Piers were abandoned, and the waterfronts lay idle in many older cities, paralleling the more general urban decay.
With the 1970's came a period of reflection on this condition and a resurgence (苏醒) of urban pride. urban renewal stopped being a license for large-scale demolition (破坏); politicians and planners took a hard. look at their available resources and began to experiment with new development techniques. Waterfronts became one focus of the large urban revitalization effort.
The primary purpose of this passage is to describe ______.
下列作品属于契诃夫的戏剧的是（）
A．In the office.B．At home.C．In department stores.D．In the hospital.
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