题目内容
阅读材料，回答题。
Unpredictable Earthquake
Humans are forever forgetting that they can&39;t control nature. Exactly 20 years ago, a Time magazine cover story announced that "scientists are on the verge of being able to predict the time, place and even the size of earthquakes." The people of quake-ravaged (被地震破坏的) Kobe learned last week how wrong that assertion was.
None of the methods conceived two decades ago has yet to discover a uniform. wanting signal that preceded all quakes, let alone any sign that would tell whether the coming temblor (地震) is mild or a killer.Earthquake formation can be triggered by many factors, says Hiroo Kanamori, a seismologist (地震学家), at the California Institute of Technology. So, finding one all-purpose warning sign is impossible. One reason :Quakes tart deep in the earth, so scientists can&39;t study them directly. If a quake precursor were found, it would still be impossible to ward humans in advance of all dangerous quakes.Places like Japan and California are fiddle with hundreds, if not thousands, of minor faults.
Prediction would be less important if scientists could easily build structures to withstand tremors. While seismic engineering has improved dramatically in the past 10 to 15 years, every new quake reveals unexpected weakness in "quake-resistant" structures, says Terry Tullis, a geophysicist at Brown University. In Kobe, for example, a highway that opened only last year was damaged. In the Northridgeearthquake, on the other hand,well-built structures generally did not collapse.
A recent report in Science adds yet more anxiety about life on the faulty lines. Researchers Fan computer simulations to see how quake resistant buildings would fall in a moderate size temblor, taking into account that much of a quake&39;s energy travels in a large "pulse" of focused shaking. The results: both steel-frame. buildings
and buildings that sit on insulating rubber pads suffered severe damage.
More research will help experts design stronger structures and possibly find quake precursors. But it is still a certainty that the next earthquake will prove once again that every fault cannot be monitored and every highway cannot be completely quake-proofed.
From the first paragraph， it can be safely inferred that__________. 查看材料
查看答案
搜索结果不匹配？点我反馈
更多问题
One of the main difficulties in accurate earthquake forecasting is that__________.
味精的化学名是()。
阅读材料，回答题。
Deport them or not
In a country that defines itself by ideals，not by shared blood，who should be allowed to come，work and live here？In the wake of the Sept．1 1 attacks these questions have never seemed more pressing．
On Dec．11，2001，as part of the effort to increase homeland security，federal and local authorities in 14 states staged“Operation Safe Travel”-raids on airports to arrest employees with false identification(身份证明)．In Salt Lake City there were 69 arrests．But those captured were anything but terrorists，most of them
illegal immigrants from Central or South America．Authorities said the undocumented workers’illegal status made them open to blackmail(讹诈)by terrorists．
Many immigrants in Salt Lake City were angered by the arrests and said they felt as if they were being treated like disposable goods．
Mayor Anderson said those feelings were justified to a certain extent，“We’re saying we want you to work in these places，we’re going to look the other way in terms of what our laws are，and then when it’s convenient for us，or when we can try to make a point in terms of national security，especially after Sept．1 1，then you’re disposable．There are whole families being uprooted for all of the wrong reasons，”Anderson said．
If Sept．1 1 had never happened．the airport workers would not have been arrested and could have gone oil quietly living in America．probably indefinitely．Ana Castr0，a manager at a Ben＆Jerry’s ice cream shop at the airport，had been workin9 10 years with the same false Social Security card when she was arrested in the December airport raid．Now she and her family are living under the threat of deportation(驱逐出境)．Castro’s case is currently waiting to be settled．While she awaits the outcome，the government has granted her permission to work here and she has returned to her job at Ben&Jerry’s．
According to the author，the United States claims to be a nation__________． 查看材料
What do we leam about Ana Castro from the last paragraph？
微信支付 
支付宝支付