A.A boy's singing saved his sister's life.
B.The little girl is well enough to go home.
C.Michael's little sister is born with a serious disease.
D.No children are allowed to enter the intensive care unit.
B
(2013·江苏五市高三第三次调研)Giant landslides (山崩) have a seismic (地震的) fingerprint that allows researchers to estimate their size, duration, and even how far they travel across the landscape, new research reveals. The finding may be particularly useful in identifying landslides that occur in steep, remote areas where few people live — not because of their immediate effects, but because such slumps (滑坡) can block rivers and impound lakes that could later destroy the natural dams and threaten populated areas downstream.
Seismometers and other such instruments record ground motions occurring at all frequencies (频率), but seismologists typically pay attention to only those in ranges where the signals of earthquakes exist. The first seismic waves caused by quakes and explosions are sharp and distinct, says Göran Ekström, a seismologist in Palisades, New York. But the lowfrequency waves caused by giant landslides are occasionally hidden in the mix of seismic vibrations (震动) booming through Earth's crust, too.
Of the 29 largest known landslides worldwide from 1980 through 2012, ground motions from the 27 largest
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