B. Because they thought the seawalls were reliable.
C. Because higher ground can’t be reached at all.
D. Because didn’t know there would be a tsunami.
20. What can we learn from the last paragraph?
A. Early warning systems are basically unreliable.
B. Earthquakes and tsunamis will soon be predicted.
C. We have to accept the imperfect systems for the moment.
D. New warning systems will be designed to predict disasters.
17-20 BDAC
*************************************************************结束
A powerful earthquake struck the northeastern coast of Japan at 2:46 p.m. local time on March 11th. Japan's Meteorological Agency released its first tsunami warnings just three minutes later. The country has one of the best earthquake early warning systems in the world. More than 4,000 Seismic Intensity Meters provide information within two minutes of an earthquake happening.
There are also concrete sea walls around much of the Japanese coastline. But these measures proved no match for the powerful earthquake and tsunami.
Costas Synolakis is a tsunami expert in the University of Southern California in Los Angeles. He says: "Japan is one of those most well-prepared countries on earth in terms of tsunami warning. They had a warning. I think what went wrong is that they had not anticipated the size of this event."
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