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30.Why can’t the prediction technique be applied in coastal waters?
A.There is too much environmental noise.
B.Tsunami signal can’t be picked up here.
C.Tsunamis often reach shore within minutes.
D.Clear tsunami signals come from deep sea.
31.What can be a suitable title for the text?
A.Study shows magnetic fields can act as early warning signs for tsunamis
B.Data drawn from the 2009 tsunami in Samoa and 2010 tsunami in Chile
C.Research carried out on how to improve modelling systems for tsunamis
D Scientists observe sea level from the magnetic fields