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  3. When scientists consider the possible effects of global warming, there is a lot they don’t know. But they can say one thing for

When scientists consider the possible effects of global warming, there is a lot they don’t know. But they can say one thing for

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问题     When scientists consider the possible effects of global warming, there is a lot they don’t know. But they can say one thing for sure: sea levels will rise.
    This rising water will be felt along the artificially maintained beaches of New Jersey, in the vanishing marshes of Louisiana, even on the ocean cliffs of California. According to a 2000 report by the Heinz Center for Science, Economics and the Environment, at least a quarter of the houses within 500 feet of the United States coast may be lost to rising seas by 2060. There were 350, 000 of these houses when the report was written, but today there are far more.
    Though most of the country’s ocean beaches are eroding, few coastal jurisdictions(管辖权)consider sea level rise in their coastal planning, and still fewer incorporate the fact that the rise is accelerating. Instead, they are sticking with policies that geologists say may help them in the short term but will be untenable(站不住脚的)or even destructive in the future.
    Florida is a good example. To prepare for hurricane season, which began on June 1 and has already brought Tropical Storm Alberto, Floridians were still repairing storm damage from 2005 and even 2004, building or repairing walls to shield beachfront buildings.
    Until May 1, when turtle nesting season forced them to stop, they were also pumping hundreds of thousands of cubic yards of sand onto eroded beaches. Florida has relied on this approach for decades, but after the past few storm seasons, there has been an increase in applications for sea wall permits, many from Mr. Tomasello’s clients. "If you have a house or a condo(集合公寓)that’s threatened, it’s really the only alternative, " he said.
    Maintaining eroding beaches with artificial infusions of sand is difficult and costly, and as sea levels rise, it may become economically impractical or even impossible. "The combination of sea walls and rising sea level will accelerate the rate of land loss in front of those sea walls", said Peter Howd, an oceanographer who conducts shoreline research for the United States Geological Survey in St. Petersburg. "So people with a sea wall and a beach in front of it will end up with just a sea wall. "
The author gives Florida as an example to show that______.
选项 A、it is effective for Floridians to protect their buildings by building walls
B、Floridians have no options but to build sea walls
C、it is not right for Floridians to rely on the traditional approach
D、Floridians should build more sea walls instead of pumping sand onto eroded beaches
答案C
解析 重点通过第四、五、六段来判断，尤其是第五段。附近居民在受侵蚀的海滩上倾倒了大量的沙子，来保护房屋。他们几十年以来依赖这种方法，但经历了过去的几次风暴后，越来越多的人申请建立防海墙。作者这里举例说明了传统方法被当地居民所摒弃。同时作者指出，建防海墙和倾倒沙子都不能解决根本问题。只有选项C正确。
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