问题补充：
The Greenbelt, a wide belt of open land around the cities and towns of the San Francisco Bay Area, includes about 3.75 million of the Bay Area’s 4.5 million acres. The Bay Area Greenbelt is one of the largest areas of open land in any U.S. urban area. Open land is land that has few buildings and lots of natural areas. The Greenbelt’s open land includes parks, forests, beaches, and more than 8,500 farms.
What are the advantages of the Greenbelt?
The Greenbelt has many advantages for people in the Bay Area, which include:
lwalking and biking areas close to the cities and towns;
lplaces for wild plants and animals;
lcleaner air and water;
lincome from farms.
Is the Greenbelt in danger?
Five hundred seventy thousand acres of the Greenbelt are in danger. There are builders who want to build suburbs on them. If those acres become suburbs, many things will change:
lthe urban and suburban area will almost double;
lmany farms will disappear;
ltraffic will become worse;
lthe air will become dirtier.
What is Greenbelt Alliance (联盟)?
Greenbelt Alliance, an organization that saves land in the San Francisco Bay Area, works alone and with other groups to save the Greenbelt in four ways:
1. Try to persuade people to build new buildings on land that is already urban, not on open land.
2. Make sure that the city and town governments are all making plans to save the Greenbelt.
3. Help Bay Area towns and cities to buy pieces of open land to make into natural areas.
4. Teach people in the Bay Area why the Greenbelt is important and what they can do to help save it.
【小题1】What can we learn about the Greenbelt from the first paragraph?A．The Greenbelt is the largest open land in the United States.B．The Greenbelt covers much more than half of the Bay Area.C．There are few farms on the open land of the Greenbelt.D．There are more than 8,500 natural areas on the Greenbelt.【小题2】One of the advantages of the Greenbelt for people in the Bay Area is .A．convenience for exerciseB．income from sightseeingC．cleaner city streetsD．more plants and animals【小题3】The Greenbelt is in danger because .A．traffic is getting worseB．some plans to build suburbs on itC．the suburban area has doubledD．pollution is becoming serious【小题4】Which of the following is TRUE about Greenbelt Alliance?A．It builds new buildings on open land.B．It buys large open land for the Bay Area.C．It educates people how to save the Greenbelt.D．It helps the city governments make plans.B
答案：
(答案→)B
解析：本文叙述了在美国的旧金山周围有一个非常大的绿化带，文中介绍了它的优点人们可以锻炼身体，呼吸新鲜空气等，但是五千零七万亩的绿地正处于危险中，一些人计划在这里盖楼，当然会带来一些问题，这样绿地联盟就开始做工作来阻止这样的事情发生。
【小题1】细节理解题。根据includes about 3.75 million of the Bay Area’s 4.5 million acres故选 B。
【小题2】细节理解题。根据walking and biking areas close to the cities and towns;可以去锻炼，故选A。
【小题3】细节理解题。根据There are builders who want to build suburbs on them.一些人想把它建成郊区，故选B。
【小题4】细节理解题。根据works alone and with other groups to save the Greenbelt 和Teach people in the Bay Area why the Greenbelt is important and what they can do to help save it.教育人们如何保护绿化带，故选C。
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